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how-to flush heater core?

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Old 10-06-2008, 08:01 PM   #1
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how-to flush heater core?

Just from reading on here, I need to flush my heater core. I have no leaks, but when I turn the heat on it feels like the a/c. Sometimes gets a little bit warm. I understand the process of flushing it out, I just need a pic of the two hoses I need to disconnect to do so. I have a 2002 chevy s10 with a 4.3 could anybody help me out?
Old 10-06-2008, 08:13 PM   #2
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Re: how-to flush heater core?

http://www.chevroletforum.com/upfile...A3F6236B1A.jpg
Old 10-06-2008, 08:36 PM   #3
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Re: how-to flush heater core?

sweet, thanks a million thats perfect
Old 10-06-2008, 08:44 PM   #4
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Re: how-to flush heater core?

if you dont want to buy that kit you can just take the hoses off the motor and use a water hose with a nozzle.had the same problem on my blazer did it that way and worked great.the core had a bunch of the dexcool mud in it.after that i flushed the whole system real good then replaced it with green antifreeze.
Old 10-06-2008, 09:15 PM   #5
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Re: how-to flush heater core?

Quote: Originally Posted by truckman
if you dont want to buy that kit you can just take the hoses off the motor and use a water hose with a nozzle.had the same problem on my blazer did it that way and worked great.the core had a bunch of the dexcool mud in it.after that i flushed the whole system real good then replaced it with green antifreeze.
Thats exactly what I did and thats exactly what mine was like...mud...
Much beter after. That link was just for a pic and to give a good idea how its done. It dosent take long to do either. How many miles do you have? You may consider replacing your thermostate too. Dont have to but its a nice peace of mind knowing that its been replaced.
Old 10-06-2008, 10:30 PM   #6
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Re: how-to flush heater core?

I have about 95,000 km (not sure what that works out to in miles) should I give it a good flush then do the whole cooling system?
Old 10-06-2008, 10:32 PM   #7
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Re: how-to flush heater core?

sry about the double post but I was just driving for about a half hour, felt the 2 hoses and the one on the left was hot and the one on the right was cold so I'm sure this is my problem, gonna flush it tomorow, I'm sure it'll work mint
Old 10-06-2008, 11:51 PM   #8
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Re: how-to flush heater core?

I was told by a dealership (1st problem ) that some S-10s need to have it done and others may not....The ones that do usually need them done every year or 2 because they clog up....the ones that dont..dont. I did mine over a year ago and its still fine. I would just flush the heater core, replace your thermostate with a new one (same temp.) and call it good. You will be fine for a long time. No need to do a complete system flush unless you realy feel the need to.
Old 10-07-2008, 08:20 AM   #9
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Re: how-to flush heater core?

honestly,i would do the whole system.dexcool isnt worth a damn.causes more problems.flush the whole system,change the thermostat and then put green antifreeze in it.
Old 10-07-2008, 01:04 PM   #10
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Re: how-to flush heater core?

Quote: Originally Posted by truckman
honestly,i would do the whole system.dexcool isnt worth a damn.causes more problems.flush the whole system,change the thermostat and then put green antifreeze in it.
X2

might as well while you're at it!
and dexcool sucks
Old 10-07-2008, 04:44 PM   #11
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Re: how-to flush heater core?

and also,since you have a 4.3 you might be able to stop any damage to the intake gaskets before they can mess up.then yoour looking at some work
Old 10-07-2008, 06:04 PM   #12
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Re: how-to flush heater core?

flushed her out, I HAVE HEAT!!!!! Just in time for good old Canadian winter. Thanks for your help guys, think I'm gonna get the whole system done in a few weeks fromvwhat you guys are saying.. Thanks again guys
Old 10-08-2008, 02:58 AM   #13
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Re: how-to flush heater core?

Glad you got it fixed. My wife had a 00 blazer, and it clogged up from the Dexcool (garbage). When my truck hit 100,000 miles I did some services to it like a new belt, new antifreeze, 02s etc. I will tell you though if you have a SES light come on soon, it is likely from the thermostat. Mine apparently stuck open after the antifreeze change because I noticed it running significantly cooler, and then came the light.

They're cheap, so i would suggest changing it. It's real easy on these trucks and less messy than a lot of other vehicles since you won't need any RTV.

-jk
Old 01-27-2010, 05:22 PM   #14
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Re: how-to flush heater core?

Hello,
I've got to do the same thing, heater core is plugged after I got some work done at the dealership.
They flushed it once, but it's plugged up again just three days after.
I just want to ask how much pressure I can put on the core without blowing it up. Is normal City Water Pressure ok?
Also, is there any cleaning solution you'd recommend to add to the dexcool before swapping it out?

Thanks,
Tom
Old 01-31-2010, 04:08 PM   #15
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Re: how-to flush heater core?

garden hose worked great for me! not too sure on a cleaner though
Old 01-31-2010, 04:54 PM   #16
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Re: how-to flush heater core?

do you have a picture of what hoses? this is older thread so the pics were gone on that link, and im in need of this badly, might call tomorrow on how much a full system flush is though, but a cheap alternative would help for now. also i guess im going to change out the dexcool for the green stuff
Old 02-01-2010, 12:09 AM   #17
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Re: how-to flush heater core?



Both are near the EGR and water pump. Follow the lines from the firewall.
Old 02-01-2010, 05:31 PM   #18
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Re: how-to flush heater core?

ok thanks ill take a peak, also, just grab the hose, and squirt it in one, and aim the other to the ground so the gunk all comes out? then just refill with coolant?
Old 02-02-2010, 05:12 AM   #19
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Re: how-to flush heater core?

Si!!
Old 02-02-2010, 09:43 AM   #20
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Re: how-to flush heater core?

i just did this last week. take the two hoses that are coming out of the fire wall.....follow them to where they connect to the motor. unclamp and remove the hoses FROM THE MOTOR, NOT THE FIREWALL. aim one down at the ground and insert a garden hose into the other. flush until water comes out clear. backflush it by doing the same thing to the other hose. boom, you're done. it took me maybe 30mins.
Old 02-02-2010, 10:37 AM   #21
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Re: how-to flush heater core?

daves farm way
http://www.youtube.com/watch?v=mMp82...rom=PL&index=2
Old 02-02-2010, 09:10 PM   #22
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Re: how-to flush heater core?

Quote: Originally Posted by Bootylicious
i just did this last week. take the two hoses that are coming out of the fire wall.....follow them to where they connect to the motor. unclamp and remove the hoses FROM THE MOTOR, NOT THE FIREWALL. aim one down at the ground and insert a garden hose into the other. flush until water comes out clear. backflush it by doing the same thing to the other hose. boom, you're done. it took me maybe 30mins.

awsome thanks, but i think my hose is forzen lol
Old 12-14-2010, 10:50 PM   #23
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Re: how-to flush heater core?

Now newb question. When you take the two heater core hoses off the engine will all the coolant come out? Also this just flushes out just heater core not the whole engine right? Is it a good idea to flush the whole system so it doesn't just replug? Thanks guys.
Old 12-15-2010, 03:14 PM   #24
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Re: how-to flush heater core?

Quote: Originally Posted by wavrun2000
Now newb question. When you take the two heater core hoses off the engine will all the coolant come out? Also this just flushes out just heater core not the whole engine right? Is it a good idea to flush the whole system so it doesn't just replug? Thanks guys.

I would flush the whole system and get rid of the dexcool, otherwise you're just going to have the same issue again... I flushed my entire system, re-filled with dexcool, and had a clogged heater core within 3 months... I'm done with dexcool.
Old 12-15-2010, 08:03 PM   #25
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Re: how-to flush heater core?

Did you use a back flush kit or did you do it some other way? Also if you hook the hose up to the cooling system do I need to worry about the pressure? I heard you have to watch the pressure when flushing the heater core or you can blow it.
Old 12-16-2010, 03:09 PM   #26
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Re: how-to flush heater core?

Quote: Originally Posted by wavrun2000
Did you use a back flush kit or did you do it some other way? Also if you hook the hose up to the cooling system do I need to worry about the pressure? I heard you have to watch the pressure when flushing the heater core or you can blow it.

I used the prestone kit.
Old 12-17-2010, 12:44 AM   #27
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Re: how-to flush heater core?

ok i did hoses and flushed the rad in my truck new thermostat.195tstat.... why is it still running at 200? i have an older truck that runs about 180 same v6 motor with 207k on it what gives?
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