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Heater core replacement procedure '99 S10?

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Old 02-29-2008, 06:26 AM   #1
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Heater core replacement procedure '99 S10?

Is this a job that should be taken to a qualified mechanic ? Or can a first timer do it himself ? Anyone know about how much this would cost to replace? I recently noticed steam coming through my vents .. so I assume that my heater core has gone bad .
ANY thoughts are appreciated !!!
Old 02-29-2008, 06:54 AM   #2
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Re: Heater core replacement procedure '99 S10?

It's a strait forward but very time consuming procedure. I have recently done mine alone (first time, I popped my heater core cherry) and it took about 5 hours no breaks (mine is a 96 thou, alittle easier).
I think it is well worth it to do it yourself as it would probably cost well over $500 to get it replaced professionally, compared to a day of your life, $60 for a new core, alittle blood and loosing your voice from cursing so much. Plus your not a real man until you've changed a heater core in a S10 .

You don't need very many tools either, for a 96 dash all that is needed is a phillips sdriver, flat sdriver, 10mm, 15mm, 5.5mm, 7mm w/ratchet, lots of extensions and a torx set.
Old 02-29-2008, 10:54 AM   #3
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Re: Heater core replacement procedure '99 S10?

i did it myself and im no genius here...mine was an 01...spent the weekend on it just last weekend...didnt know what i was doing and/or exactly what i was looking for...but i did it...took awhile...several breaks...several too many f bombs...but its all good...you save a shitload doing it yourself....i spent 59 bucks, 53 for the heatercore and 6 bucks for an extension i needed...instead of 800+ the dealership wouldve charged....those assholes.

and i pretty much used the same tools yellownoma used...as well as a 13mm....both wrench and socket

Last edited by 01x.joyride; 02-29-2008 at 10:55 AM. Reason: add in a tool used.
Old 03-02-2008, 12:58 AM   #4
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Re: Heater core replacement procedure '99 S10?

I just did mine in my 99 a couple months ago. I had mine done in no time, maybe 3 hours total time spent working. I used to be one of those pricks at the dealership though

I've got a few pics I took of the process if you want me to send em your way let me know.
Old 03-04-2008, 12:17 PM   #5
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by Dr Evil
I just did mine in my 99 a couple months ago. I had mine done in no time, maybe 3 hours total time spent working. I used to be one of those pricks at the dealership though

I've got a few pics I took of the process if you want me to send em your way let me know.
post them on here, I know I'd like to see them. mine will go bad soon im sure lol
Old 03-04-2008, 10:29 PM   #6
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Re: Heater core replacement procedure '99 S10?

I dont have anywhere to host the pics at but I could email em to you. Or someone not as lazy as me who has a photophucket account could host em
Old 03-04-2008, 10:44 PM   #7
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Re: Heater core replacement procedure '99 S10?

It's not that bad , did mine the Sunday of the Daytona 500 on the '96 Blazer , plus flushed the entire cooling system and a few other repairs and made it home in time to see the fifty laps of the race. Started on the Blazer about 10:00 in the morning.
Old 03-05-2008, 12:12 AM   #8
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Re: Heater core replacement procedure '99 S10?

Step 1, arm yourself with at least a 12 pack of your favorite adult beverage. I prefer Yuengling lager or something similar. Natural ice works too. I did half of mine one day. The reinstall the next. Total time working was just about 3 hours or so. This is my first write up so go easy and dont flame me too bad guys.

Remove battery. Remove the glove box. Remove under dash trim/hush panels. Remove speaker covers and screws underneath, defrost vent difuser and screws under it that hold the dash to firewall. Its a good idea to leave one or two in till you're ready to remove the entire assembly.
Remove the bolts holding up the steering column. Some like to remove it all-together. I just loosen everything up and drop it down onto the seat.
Jack front right of truck up and remove right front wheel. Remove inner fender. To remove the inner fender you'll have to loosen the PCM nad part of the battery tray and a few other misc bolts. I didnt remove my inner fender all the way, just enough to be able to reach through and work at the firewall.

Drink beer, admire your work thus far.

You'll need to remove a couple of 10 mm bolts at each end of the dash assembly in the lower corners. Here is where it can get tricky. When I do this I do not remove the radio, inst cluser, hvac controls...nothing. I get under the dash and disconnect everything that I can which is everything but the radio as best I remember. You'll need to disconnect the main elec block on the drivers side (7mm) in the center of the connector there is a bolt. Loosen it, pull it out. I remove the BCM too. While I'm there I also disconnect the vac lines to the HVAC stuff, air bag connectors(yellow) etc etc.

Once you're sure that things are disconnected step back and have another beer or three.

Remove the aforementioned screws at the top of the dash and the entire dash should rotate down/back. The entire assembly sits on two locating pins at the base of each A pillar and the frame for the dash is slotted to fit in there. You'll know it when you see it. I rotate the dash down and lay it on the seat/steering column and reach behind it to disconnect any other wires such as the radio wires and antanae wire as needed. Once you're satisfied everything has been disconnected grab a buddy, gf or wife and kift and remove the dash. You'll be left with firewall, a bunch of wires, a few hoses, a big black box looking thing and a steering column laying on your seat. This is normal.

Drink beer, admire work.

The black box thing is where your heater core is. On the bottom there are a couple of nuts/bolts(10mm) you can remove from inside the cab. Remove/disconnect the vaccum hoses as needed.

Under the hood.
There is one bolt/nut(10mm) on top that is easy to get to beside the hoses.
Go through the hole/gap in the inner fender you made earlier and remove one more 10mm. Here comes the fun part. On top of your box where the ac lines go into it there is an electrical connector. This goes to the resistor for your blower motor. It should have 2 or 3 very small screws holding the whole thing down. Remove those and you will be able to remove the entire resistor and cover. e careful not to damage it. You will be left with a small rectangular hole that is big enough for my 3 year old to get his hand into but not me. Some dealerships/shops will remove the entire assembly that you see to get to this one freakin bolt/nut adding hours of labor. Not me, I'm all about shortcuts. Work smart not hard right? Peer into this opening (you may need a mirror) and you will see several inches down another 10mm. Thats the one you need to get out. I used a 1/4" MAC air ratchet and a 10mm wobble head socket. I had it out in 30 seconds. Dont worry about dropping it in there either since I know I'm taking the whole box out anyways.

TIP: When putting it back in if you choose too, put a piece of notebook paper about the size of a dime on top of the socket opening and force the nut/bolt into the socket. This will hold the darned thing in the socket so it wont fall out whilst you try to put it back in...if you choose to. Some people leave it out.

Once all your bolts/nuts are removed you can remove the HVAC module assembly. Its pretty self explainatory from here. Pop the top open and swap heater cores. Drink more beer, you've earned it.

Put it all back together.

I'm sure I've left some out but thats the best I can remember off the top of my head at 10 minutes past midnite. Anyone else sees anything I've omitted chime in but this should be enough to get you through it if you're halfway inclined.

Here are some pics I took of mine during the process.



The steering column



Two of the bolts/nut you can access from the cab. (box is upside down)




Another location of bolt/nut



Yet another



And another




Opening in fenderwell




Resistor removed for access to bastard bolt.




Time to drink beer, its out.




Elec connections to remove/seperate (7mm bolt)




Wires and stuff everywhere! Better have another beer.

Last edited by Dr Evil; 03-05-2008 at 12:19 AM.
Old 03-05-2008, 12:52 AM   #9
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Re: Heater core replacement procedure '99 S10?

very nice, thanks for that info and the pics! it WILL come in handy.

one thing i will add is that on blazers/jimmys etc, there is a plastic "shell" on the casing in the engine bay. to get access to the resistor, you have to actually cut the plastic. removal is the same as the S10/sonomas at that point.
Old 03-05-2008, 04:00 PM   #10
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Re: Heater core replacement procedure '99 S10?

I just did mine in my 97 S10. Was my first time. It took me about 7 hours to do by myself and I had never taken a dash apart before. I did find that I have removed more stuff than needed and if you swivel the dash forward and lift it up and out, the heater core cover is easy to get out. I paid $$35.00 for the new heater core and I was quoted over $600 for labor.
Old 03-27-2008, 11:54 AM   #11
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Re: Heater core replacement procedure '99 S10?

My heater fan is making a lot of noise, would that be about the same I have to do to replace that?
I also need to check the vacuum lines because I have some whistling sound sometimes. And on longer drives the vents close off and I have to switch around between defrost and floor venting a couple times until I can get airflow again.

Any ideas??
Old 09-28-2008, 11:09 AM   #12
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Re: Heater core replacement procedure '99 S10?

I just did mine, it took about 6 hrs with no experience and some cheap labor (friend was paid in beer). I was able to separate the dash enough to get the box loosened off the wall and change the core that way. It was still a pain getting to the one bolt in the resistor hole. On the bright side, I took the overflow out, cleaned it out and completely flushed all that damned Dex-Cool out. Also was able to finally get the front edge of the dash clean. I surre hope this one liuves for a while.

Dave
Old 09-28-2008, 12:56 PM   #13
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Re: Heater core replacement procedure '99 S10?

Excellent write-up, Dr. Evil!!

I think that I'd seriously consider selling my Blazer before I'd tackle this job though.
Old 09-28-2008, 01:18 PM   #14
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Re: Heater core replacement procedure '99 S10?

I just sent a PM to Pewter01 to make this thread into a sticky. If you agree, send him a PM too.
Old 09-29-2008, 12:45 PM   #15
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by SmokeeJay
I just did mine in my 97 S10. Was my first time. It took me about 7 hours to do by myself and I had never taken a dash apart before. I did find that I have removed more stuff than needed and if you swivel the dash forward and lift it up and out, the heater core cover is easy to get out. I paid $$35.00 for the new heater core and I was quoted over $600 for labor.
only the 94-97 can be tilted

98+ has to be removed
Old 10-19-2008, 01:00 PM   #16
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[quote=SmokeeJay;5003934]I just did mine in my 97 S10. Was my first time. It took me about 7 hours to do by myself and I had never taken a dash apart before. I did find that I have removed more stuff than needed and if you swivel the dash forward and lift it up and out, the heater core cover is easy to get out. I paid $$35.00 for the new heater core and I was quoted over $600 for labor.[/quo
Hey, Smokee, you still around? I have a '97 JIMMY...same problem. Y mentioned you removed more than you needed to...care to elaborate? maybe save me some time and trouble. Thanks, wingman
Old 10-19-2008, 03:30 PM   #17
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Re: Heater core replacement procedure '99 S10?

One thing I would add here is to use a generous amount of silicone just before install, around the tubes where they enter the core. The tubes are held in place by a couple of crimps and a gasket. I did this the second time after the first install failed in 6 months. No leaks and it's been several years now.
Old 10-26-2008, 11:40 PM   #18
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Re: Heater core replacement procedure '99 S10?

Just did one in an 01 zr2... he was quoted twice at $800. I charged him $500 (parts included)... Plus i did two ujoints, door pins and fixed wiper linkage... When i brought it back he gave me $600 and was very happy... Dr. Evil posted the best instuctions you could get and it was exactly how i did it!
just have patients and plan your attack, and most importantly... DONT FORGET THE BEER
Old 01-04-2009, 07:28 PM   #19
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Re: Heater core replacement procedure '99 S10?

We just got the core out of 03 S10 crewcab.. F bombs everywhere!
There are just enough differences in the 03 to make you wanna kill somebody..
Example all the bolts evil says are in the cab are in the engine/fenderwall/ firewall..Argggh! we will post pics later to add to evils great slideshow!
Old 01-29-2009, 02:14 PM   #20
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Re: Heater core replacement procedure '99 S10?

I just put a heater core in a 2000 Blazer yesterday, it took me about 7 hours. I didn't have any trouble with the bolt in the AC box, but the one directly behind the RH manifold was hard to get to. I took the inner fender out, and the 3 nuts/clips directly under the battery broke, but I was able to get replacements at Auto Zone. Here's some more info I found for anyone else who will be replacing theirs.

http://www.s-10crewcab.com/phpBB2/viewtopic.php?t=3579

and some pics I found which were useful.

http://s395.photobucket.com/albums/p...20Replacement/

Last edited by ericknight; 01-29-2009 at 02:17 PM. Reason: fixed link
Old 02-05-2009, 02:27 PM   #21
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Re: Heater core replacement procedure '99 S10?

ok now you do have to take the instrumentpanel out theres two 7mm bolts holding the dash in. But other than that me and my buddy had mine out in a hour just one person on each side. i just hope all this can go back in easy.
Old 02-06-2009, 10:11 PM   #22
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Re: Heater core replacement procedure '99 S10?

Well yes i agree theres a few aggrivations but 4 bolts under the hood and a few on the inside. your good you only need it out far enough to get the old core out and it took me all in all about 3 hours kinda made me feel like i did something great with nothing to show for it.
Old 02-07-2009, 10:25 AM   #23
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by FK-IT
Well yes i agree theres a few aggrivations but 4 bolts under the hood and a few on the inside. your good you only need it out far enough to get the old core out and it took me all in all about 3 hours kinda made me feel like i did something great with nothing to show for it.
So, you didn't take the instrument panel all the way out or what?
How did you do it so fast?
Old 02-09-2009, 01:30 PM   #24
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Re: Heater core replacement procedure '99 S10?

i really don't know.. its not hard at all just take your glovebox out. then the front face of the dash. take your panel out. theres two bolts behind there. theres bolts in the coners of your dash. take your speaker covers off the top and pop off the middle vent undo those screws. drop your steering colum and start unpluggin anything thats caught. and then under the hood- if you take the passenger front tire off and jack it up its easy but through the flap on the firewall theres a bolt then 3 others up top and your good. THE THING IS YOU DON'T HAVE TO TAKE IT ALL THE WAY OUT. JUST GET IT LOOSE AND TILT IT TO GET THE CORE OUT AND THE NEW ONE IT..
Old 02-22-2009, 01:38 PM   #25
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Re: Heater core replacement procedure '99 S10?

How about a heater core replacement of an 1997 Blazer.

See my pictures I posted.
Same procedure or little bit easier?

http://www.s10forum.com/forum/f136/h...6/#post6056838

bob
Old 03-04-2009, 03:49 AM   #26
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Re: Heater core replacement procedure '99 S10?

After reading this how to I can see why I've been riding without heat for the past 2 winters. I can't justify spending that kind of money, and I'm too lazy to do it myself. The dealership quoted me at $1400, can you believe it? Local garage quoted me at $800, a little better, but I'll be damned if I'm gonna pay that much, I'll put a damn woodstove in the extended cab and run a chimney through the roof before I give somebody $1400 to fix my heat.
Old 03-04-2009, 08:03 PM   #27
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by Merritj2417
After reading this how to I can see why I've been riding without heat for the past 2 winters. I can't justify spending that kind of money, and I'm too lazy to do it myself. The dealership quoted me at $1400, can you believe it? Local garage quoted me at $800, a little better, but I'll be damned if I'm gonna pay that much, I'll put a damn woodstove in the extended cab and run a chimney through the roof before I give somebody $1400 to fix my heat.

I was gonna say if you are close to knoxville just bring it over one day and we'll knock it out but you're easily 4 hours away.
Old 03-04-2009, 10:48 PM   #28
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by Dr Evil
I was gonna say if you are close to knoxville just bring it over one day and we'll knock it out but you're easily 4 hours away.
I'll be there in a minute.
Old 03-06-2009, 08:56 AM   #29
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Re: Heater core replacement procedure '99 S10?

no but serioulsy mrrit i live in archdale nc nd can do it for u in a day easy nd alot cheaper than 800.00
Old 03-07-2009, 11:09 AM   #30
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Re: Heater core replacement procedure '99 S10?

anyone wana come to tx and do this for me?? i got a case of beer for ya
Old 04-06-2009, 03:00 PM   #31
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Re: Heater core replacement procedure '99 S10?

How do you remove the inner fender, why do you have to remove the battery i did both and the fender still seems attached?
Old 04-06-2009, 11:24 PM   #32
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Re: Heater core replacement procedure '99 S10?

Me and sockjock replaced mine finally. It didn't take us long, just 13 hours, lol. When GM made the '03 S10 they didn't want you to be able to take it apart, that's for sure. There were nuts and bolts in all kinds of tight spaces, but we finally got it done and now the heat works!
Old 04-13-2009, 01:23 AM   #33
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Re: Heater core replacement procedure '99 S10?

This makes me want to cry....LOL. I recently bought a 96 s10. Previousowner had it disconnected. He said in Florida you didn't need heat. It sucks not having defrost during rain. I was quoted 400-600. part under $80.00.
Old 04-19-2009, 10:14 PM   #34
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Re: Heater core replacement procedure '99 S10?

thats intense
Old 04-20-2009, 11:47 AM   #35
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Re: Heater core replacement procedure '99 S10?

Somebody want to . come and give me a hand on my 96 Im in decatur IN
Old 04-26-2009, 05:01 PM   #36
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Re: Heater core replacement procedure '99 S10?

Mine went out in my 2000... I'm just going to connect the inlet and outlet and by pass the heater core all in itself...
Old 05-03-2009, 09:38 PM   #37
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Re: Heater core replacement procedure '99 S10?

thats what im gona do as well navybrat
Old 05-07-2009, 11:15 PM   #38
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Re: Heater core replacement procedure '99 S10?

when your heater core is gone do you still have heat coming thru the vents.
Old 06-10-2009, 12:37 PM   #39
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Re: Heater core replacement procedure '99 S10?

woooohoooo! thank for the info guys. sounds easy enough. and cheap.
Old 08-18-2009, 12:49 PM   #40
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Re: Heater core replacement procedure '99 S10?

Be careful bi-passing the heater core. On mine the inlet is a different size than the output. Wouldn't want to have it pop in the bush.
Old 09-03-2009, 03:52 PM   #41
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Re: Heater core replacement procedure '99 S10?

It took a few hours but it wasnt that bad... and im a girl. lol
Old 09-24-2009, 12:33 PM   #42
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Re: Heater core replacement procedure '99 S10?

Dr. Evil Your write up is amazing.



Old 10-15-2009, 05:50 PM   #43
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Re: Heater core replacement procedure '99 S10?

Write up was good and helped a lot. Didn’t put the bolt back in near AC coil.
Did mine this weekend on a 99 X. Took me about 4 hours to get everything unhooked and ready to go back together, would have been shorter but had back surgery 3 weeks earlier so I took it easy. About an hour to put back together.
Anyways, I made sure I clipped in the air bag plugs and put the little orange clips back in but my air bag light is still on. I have driven it about 200 miles since but hasn’t gone out. Any way to reset?
JT
Old 12-14-2009, 10:12 PM   #44
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Re: Heater core replacement procedure '99 S10?

I assume you don't have to put back all those screws and bolts that you took out? That usually makes the install quicker.
Old 01-03-2010, 04:48 AM   #45
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by Dr Evil
Step 1, arm yourself with at least a 12 pack of your favorite adult beverage. I prefer Yuengling lager or something similar. Natural ice works too. I did half of mine one day. The reinstall the next. Total time working was just about 3 hours or so. This is my first write up so go easy and dont flame me too bad guys.

Remove battery. Remove the glove box. Remove under dash trim/hush panels. Remove speaker covers and screws underneath, defrost vent difuser and screws under it that hold the dash to firewall. Its a good idea to leave one or two in till you're ready to remove the entire assembly.
Remove the bolts holding up the steering column. Some like to remove it all-together. I just loosen everything up and drop it down onto the seat.
Jack front right of truck up and remove right front wheel. Remove inner fender. To remove the inner fender you'll have to loosen the PCM nad part of the battery tray and a few other misc bolts. I didnt remove my inner fender all the way, just enough to be able to reach through and work at the firewall.

Drink beer, admire your work thus far.

You'll need to remove a couple of 10 mm bolts at each end of the dash assembly in the lower corners. Here is where it can get tricky. When I do this I do not remove the radio, inst cluser, hvac controls...nothing. I get under the dash and disconnect everything that I can which is everything but the radio as best I remember. You'll need to disconnect the main elec block on the drivers side (7mm) in the center of the connector there is a bolt. Loosen it, pull it out. I remove the BCM too. While I'm there I also disconnect the vac lines to the HVAC stuff, air bag connectors(yellow) etc etc.

Once you're sure that things are disconnected step back and have another beer or three.

Remove the aforementioned screws at the top of the dash and the entire dash should rotate down/back. The entire assembly sits on two locating pins at the base of each A pillar and the frame for the dash is slotted to fit in there. You'll know it when you see it. I rotate the dash down and lay it on the seat/steering column and reach behind it to disconnect any other wires such as the radio wires and antanae wire as needed. Once you're satisfied everything has been disconnected grab a buddy, gf or wife and kift and remove the dash. You'll be left with firewall, a bunch of wires, a few hoses, a big black box looking thing and a steering column laying on your seat. This is normal.

Drink beer, admire work.

The black box thing is where your heater core is. On the bottom there are a couple of nuts/bolts(10mm) you can remove from inside the cab. Remove/disconnect the vaccum hoses as needed.

Under the hood.
There is one bolt/nut(10mm) on top that is easy to get to beside the hoses.
Go through the hole/gap in the inner fender you made earlier and remove one more 10mm. Here comes the fun part. On top of your box where the ac lines go into it there is an electrical connector. This goes to the resistor for your blower motor. It should have 2 or 3 very small screws holding the whole thing down. Remove those and you will be able to remove the entire resistor and cover. e careful not to damage it. You will be left with a small rectangular hole that is big enough for my 3 year old to get his hand into but not me. Some dealerships/shops will remove the entire assembly that you see to get to this one freakin bolt/nut adding hours of labor. Not me, I'm all about shortcuts. Work smart not hard right? Peer into this opening (you may need a mirror) and you will see several inches down another 10mm. Thats the one you need to get out. I used a 1/4" MAC air ratchet and a 10mm wobble head socket. I had it out in 30 seconds. Dont worry about dropping it in there either since I know I'm taking the whole box out anyways.

TIP: When putting it back in if you choose too, put a piece of notebook paper about the size of a dime on top of the socket opening and force the nut/bolt into the socket. This will hold the darned thing in the socket so it wont fall out whilst you try to put it back in...if you choose to. Some people leave it out.

Once all your bolts/nuts are removed you can remove the HVAC module assembly. Its pretty self explainatory from here. Pop the top open and swap heater cores. Drink more beer, you've earned it.

Put it all back together.

I'm sure I've left some out but thats the best I can remember off the top of my head at 10 minutes past midnite. Anyone else sees anything I've omitted chime in but this should be enough to get you through it if you're halfway inclined.

Here are some pics I took of mine during the process.



The steering column



Two of the bolts/nut you can access from the cab. (box is upside down)




Another location of bolt/nut



Yet another



And another




Opening in fenderwell




Resistor removed for access to bastard bolt.




Time to drink beer, its out.




Elec connections to remove/seperate (7mm bolt)




Wires and stuff everywhere! Better have another beer.
I have a question , in the last pic does the bracket thing that holds the steering column come out? the reason i ask is its in the way and i need to remove my brake booster. looks like it does just wanna make sure before i pull out the dash.
thanks for any help
Old 01-08-2010, 10:27 PM   #46
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Re: Heater core replacement procedure '99 S10?

Yes it does..., It aint easy to get out thogh..(My experience was from a 98 blazer) but if you wanted to..., get a 3/8drv 20-24in extension.., 3/8 ratchet.., a 15mm or a 9/16's deepweel socket(it depends on size of nuts on booster), and a 3/8 "broke-neck" swivel. You don't have to pull dash or stuff like that. Just use the tools above and work those nuts off brake booster. The hush panels will definetly have to be removed..., but from my experience.., I ain't never had to pull a dash to get a booster out.
Old 01-08-2010, 11:39 PM   #47
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Post Re: Heater core replacement procedure '99 S10?

95-97 s10/blazer heater core removal from my memory
is about the easiest thing to do.... (some steps are combined.., no flaming me if i miss something...lol 'cause I do suffer from C.R.S.) (cant remember-)

tools needed:
small pocket screw driver (for removing wire connectors)
torx socket/screw driver set (t10-t30)
15mm deep well socket
6" 3/8 drv extension
3/8 drv ratchet
1/4drv ratchet
1/4drv 3"-6" extensions
1/4drv 9/32 or 7mm deep well socket
1/4drv 5/16 or 8mm deep well socket
screwdriver
phillips screwdriver
a short handle hammer
needle nose pliers
standard pliers
maybe - small prybar

step1 - remove the following: defront vent(careful.., it snaps in and will break easily) / speaker covers(two torx screws-then slide then toward rear of truck) / both kick panels(clips in) / both winshield post panels(clips in) /(a maybe) floor shift console (if it aftermarket and buched up close to dash)
remove lower dash cover (from under column to hush cover)

step2- driver side - unclip big yellow wire near column(SRS-airbag) USE 9/32 or 5/16 SOCKET-unscrew bolt in center of wiring block for steering column | then use 9/32 to remove screw holding the block to dash (it a extra precaution) | then use 10mm socket to get to the bolts that are bolted almost straight up near dash corner holder pins....(feel up in bottom corners of dash.., or near there.., you'll find them) | remove torx screw holding center hvac box hush cover - (it screws straight in towards passenger side)

step3- passenger side | remove BCM to get it out of your way... | unscrew bolt in center of dash harness connector block | unnconnect all connector blocks near kick panel | if see the attenae connector ner there, unhook it and unconnect attenae | remove the screw on side of hvac hush cover here as well..

step4 - driver side again...get 15mm socket/ratchet/6in extension unbolt the (4) nuts holding steering column. | If wished to make it extremely simple.., use white marking pen on base of column-flex joint(mark both shaft and joint in one line) then use 15mm socket there and remove the nut there and then push bolt thru - use something to tap on joint while someone pulls out on column. | now remove all screws across top of dash near windshield. leave the center screw in for now...

step5 - get friend over to help on this... remove center screw and tilt dash back | have friend hold it to make sure it doesnt tilt too far back as to destroy certain hvac lines and any other wire connections | in center on backside.. hvac vent lines are snapped together in a plug-in block...seperate them. | tilt dash more towards rear...slowly as to not rip/break anything | whatever you could not get to to unplug or unscrew, do it now. reach behind dash and get it done. On some strange models.., I have found ground straps back there.., make sure to unscrew them (never under stood why on a plastic dash...really wierd) | unhook/unconnect wires near column support or above it that are connected to dash or dash harness now... | if dash is tilted as far back as can be make sure no connections are left from dash to firewall.... lift up dash and pull outwards at a 60degree angle and put it outside truck for easy re-install. | the big black cover in middle to passenger side is the cover for heater core. 4 screws hold cover on. Cover can be removed but it will take a little tinkering to get it to come out without breaking | remove them now. | open hood | remove the clamps holding the hoses to heater core and then remove hoses. if any clapms or brakets are there that are bracing the two pipes together with a screw..., remove it now. | go back inside and remove the 4 small screws that are holding the core braces over the heater core. remove the heater core.

Step6 - reverse the steps for installation | NOW ...drink more beer !! rejoice that u save a bunch of money...on yur car insurance (bad joke there..very bad joke)

Step7 - tell yur friends u know that has any of the following years vehicles that U can "hook" them up on a sweet deal for a heater core replacement. (make u some $$$ out of this.., Cause I didnt write it for my health ya know...lol)
95-97 blazer /s10/jimmy/bravada and even DODGE fullsize pickups(up to 2500 series!!)

Step8 - make sure friend doesn't drink all yur beer..-if does, make sure he got wheels to go get u more at his expense!! (sorry.., me poor and all I do spend on beer is mostly for me and I dont mind sharing.., as long as they know they got to buy some as well...)

Step9 - go to town and cruise in comfort..knowing u got HEAT in yur ride and feel sorry for the other joker that don't.
Old 01-13-2010, 12:14 AM   #48
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Re: Heater core replacement procedure '99 S10?

Quote: Originally Posted by navybrat02
Mine went out in my 2000... I'm just going to connect the inlet and outlet and by pass the heater core all in itself...
I just did this temporarily.


Quote: Originally Posted by zr2bccan
Be careful bi-passing the heater core. On mine the inlet is a different size than the output. Wouldn't want to have it pop in the bush.
5/8" and 3/4"...they sell a plastic adapter about 3"-4" at Advance Auto for a couple bucks I used. The only thing is the hoses need to be released from the holder/bracket so the hoses don't get kinked.

Quote: Originally Posted by my_nightmare
95-97 s10/blazer heater core removal from my memory
is about the easiest thing to do.... (some steps are combined.., no flaming me if i miss something...lol 'cause I do suffer from C.R.S.) (cant remember-)
Thanks for the write up, I too have a 97' S10 fleetside.
I'm just hoping for some warmer temps before I bite the bullet....In other words, I'm just procrastinating! LOL...

Last edited by Bills Dad; 01-13-2010 at 12:19 AM.
Old 10-21-2010, 09:45 PM   #49
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Re: Heater core replacement procedure '99 S10?

Thanks to all that came before I did. I did my heater core in my 98 s10, 4 hrs,but could not have done it with out the knowledge the hidden bolts -Thank you-Thank you

Old 10-27-2010, 10:14 AM   #50
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Re: Heater core replacement procedure '99 S10?

got mine knocked out in about 6 -7 hours worked on it about a hour and a half a day, wasnt as bad as i thought it was going to be and now i love my truck again. radio had to be pulled because of the radio antenae but that was the only real snag i came across.
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