Just bought a 98 Blazer and i got no heat

20vturbodub · 01-31-2006, 02:27 PM

i picked up a 98 Blazer 4 door the LS model, with 121000 miles, all highway, its a very clean car, i got i for 2700 bucks

, first thing i noticed when driving it after 3 days is the heat dont work anymore, my friend who works at chevy told me the heater core is probably clogged or i need a new one, how much would a mechanic charge to fix this?

tc29720 · 01-31-2006, 02:30 PM

Try your thermostat also man, i had a similar problem, switcherdit and all was good

clancy98 · 01-31-2006, 02:30 PM

I dont know how to specifically fix this problem, but if it were me I would buy a shop manual for your truck, your probably gonna need it anyways, and it'll have a step by step with pictures...

CLancy

20vturbodub · 01-31-2006, 02:52 PM

so where is the thermostat located. its fn raining here in NY, i was happy that i bought this cuz i just got rid of my 95 jeeo with no heat, and now im stuck with this shit again!

20vturbodub · 01-31-2006, 02:53 PM

how much do they go for also?

st8542 · 02-12-2006, 09:44 PM

I have a 99 Blazer LS and had the same problem. I replaced the thermostat. STILL NO HEAT... I back flushed the heater core....MORE HEAT THAN EVER....Take off both hoses that go into and from the core. Add a piece of hose 4ft. to the inlet tube and run water thru a garden hose into the outlet. You wll be suprised what comes out. Hope you have as much luck as I did.......

madme · 02-12-2006, 10:14 PM

i had almost the same problem and i back flushed mine aswell. it worked amazing then about a month later it poped on me lol so had to put a new one in.

Vsandme · 02-15-2006, 11:44 AM

ooook, the question is do you guys have the standard a/c and heat or the computerized climate control? i have the computerized climate control and my heater doesnt work....could be the same problem though right?

FLcruising · 02-19-2006, 03:21 PM

It could be a numer of things. Check the heater core hoses after the engine's warmed up and see if they are warm, both should be. The easy way to see if the core is clogged is to disconnect the hoses at the engine and pump and blow into one of them, coolant should come out the other, just like blowing the water out a water hose.
Another thing is the temperature flapper behind the glove box might not be actuating. I believe that one is electric actuated, whereas the vent selector is vacuum actuated. If the temp flapper doesn't work, then you won't get heat either. Could be a bad actuator.

One more thing, my old 2.2 sonoma ran low on antifreeze once which caused the no heat condition too.

Holeshot · 02-26-2006, 12:24 PM

I guarentee you it's a plugged heater core.

blazer97 · 03-24-2006, 02:37 PM

My heater core was pluged also and back flushing worked great (5 times).

dragginblaze · 04-19-2006, 07:32 PM

stupid question kinda too, what and were is the heater core at, i have the same prob, also can u do it for ac too. thanks

Rob454 · 04-20-2006, 12:36 AM

Dealer will ask about 750-900$ for the job. A mechanic will be at about 450-500$. I did it myself. Cost 80$ for the heater core and abotu 4 hours of my time.
its really not a hard job. Its jsut tedious because there is a bunch of stuff to remove. I was gonna have it done but those were the prices I was quoted so i just did it myself

Rob

CRAZYASSREDNECK10 · 04-23-2006, 02:43 AM

I had same exact problem with my 98. mine would blow very little heat. going down the road about 55 and you stomp it and get the rpm's at redline the heat would work for a few more minutes. i had to un hook heater core at fire wall. filled with oven cleaner and hooked air to a hose and blew it out and then blew it out with water and been worked rest of the winter

01-31-2006, 02:27 PM	#1
20vturbodub Registered User Age: 22 Join Date: Jan 2006 Posts: 12 Location: User is: OffLine	Just bought a 98 Blazer and i got no heat i picked up a 98 Blazer 4 door the LS model, with 121000 miles, all highway, its a very clean car, i got i for 2700 bucks , first thing i noticed when driving it after 3 days is the heat dont work anymore, my friend who works at chevy told me the heater core is probably clogged or i need a new one, how much would a mechanic charge to fix this?
	[Reply w/Quote]

01-31-2006, 02:30 PM	#2
tc29720 www.metal-werx.com Age: 28 Join Date: Aug 2005 Posts: 37 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat Try your thermostat also man, i had a similar problem, switcherdit and all was good
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01-31-2006, 02:30 PM	#3
clancy98 bangin Woofenhogens Age: 29 Join Date: Aug 2005 Posts: 363 Location: Cbus, OH User is: OffLine	Re: Just bought a 98 Blazer and i got no heat I dont know how to specifically fix this problem, but if it were me I would buy a shop manual for your truck, your probably gonna need it anyways, and it'll have a step by step with pictures... CLancy
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01-31-2006, 02:52 PM	#4
20vturbodub Registered User Age: 22 Join Date: Jan 2006 Posts: 12 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat so where is the thermostat located. its fn raining here in NY, i was happy that i bought this cuz i just got rid of my 95 jeeo with no heat, and now im stuck with this shit again!
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01-31-2006, 02:53 PM	#5
20vturbodub Registered User Age: 22 Join Date: Jan 2006 Posts: 12 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat how much do they go for also?
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02-12-2006, 09:44 PM	#6
st8542 Registered User Join Date: Feb 2006 Posts: 1 Location: PA User is: OffLine	Re: Just bought a 98 Blazer and i got no heat I have a 99 Blazer LS and had the same problem. I replaced the thermostat. STILL NO HEAT... I back flushed the heater core....MORE HEAT THAN EVER....Take off both hoses that go into and from the core. Add a piece of hose 4ft. to the inlet tube and run water thru a garden hose into the outlet. You wll be suprised what comes out. Hope you have as much luck as I did....... Last edited by st8542 : 02-12-2006 at 09:46 PM.
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02-12-2006, 10:14 PM	#7
madme Registered User Age: 24 Join Date: Apr 2004 Posts: 322 Location: Oshawa User is: OffLine	Re: Just bought a 98 Blazer and i got no heat i had almost the same problem and i back flushed mine aswell. it worked amazing then about a month later it poped on me lol so had to put a new one in.
	[Reply w/Quote]

02-15-2006, 11:44 AM	#8
Vsandme Registered User Age: 22 Join Date: Feb 2004 Posts: 316 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat ooook, the question is do you guys have the standard a/c and heat or the computerized climate control? i have the computerized climate control and my heater doesnt work....could be the same problem though right?
	[Reply w/Quote]

02-19-2006, 03:21 PM	#9
FLcruising Registered User Age: 29 Join Date: Jan 2004 Posts: 164 Location: Fort Walton Beach User is: OffLine	Re: Just bought a 98 Blazer and i got no heat It could be a numer of things. Check the heater core hoses after the engine's warmed up and see if they are warm, both should be. The easy way to see if the core is clogged is to disconnect the hoses at the engine and pump and blow into one of them, coolant should come out the other, just like blowing the water out a water hose. Another thing is the temperature flapper behind the glove box might not be actuating. I believe that one is electric actuated, whereas the vent selector is vacuum actuated. If the temp flapper doesn't work, then you won't get heat either. Could be a bad actuator. One more thing, my old 2.2 sonoma ran low on antifreeze once which caused the no heat condition too. Last edited by FLcruising : 02-19-2006 at 03:22 PM.
	[Reply w/Quote]

02-26-2006, 12:24 PM	#10
Holeshot Canadian Dictatorship Age: 34 Join Date: Sep 2002 Posts: 233 Location: Chilliwack, BC, Canada User is: OffLine	Re: Just bought a 98 Blazer and i got no heat I guarentee you it's a plugged heater core.
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03-24-2006, 02:37 PM	#11
blazer97 Registered User Age: 47 Join Date: Dec 2005 Posts: 2 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat My heater core was pluged also and back flushing worked great (5 times).
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04-19-2006, 07:32 PM	#12
dragginblaze CHANGE YOUR EMAIL ADDRESS Age: 22 Join Date: Sep 2004 Posts: 247 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat stupid question kinda too, what and were is the heater core at, i have the same prob, also can u do it for ac too. thanks
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04-20-2006, 12:36 AM	#13
Rob454 Registered User Age: 37 Join Date: Mar 2005 Posts: 190 Location: User is: OffLine	Re: Just bought a 98 Blazer and i got no heat Dealer will ask about 750-900$ for the job. A mechanic will be at about 450-500$. I did it myself. Cost 80$ for the heater core and abotu 4 hours of my time. its really not a hard job. Its jsut tedious because there is a bunch of stuff to remove. I was gonna have it done but those were the prices I was quoted so i just did it myself Rob
	[Reply w/Quote]

04-23-2006, 02:43 AM	#14
CRAZYASSREDNECK10 Gas drinker Age: 24 Join Date: Apr 2006 Posts: 132 Location: Tunice Ms User is: OffLine	Re: Just bought a 98 Blazer and i got no heat I had same exact problem with my 98. mine would blow very little heat. going down the road about 55 and you stomp it and get the rpm's at redline the heat would work for a few more minutes. i had to un hook heater core at fire wall. filled with oven cleaner and hooked air to a hose and blew it out and then blew it out with water and been worked rest of the winter
	[Reply w/Quote]