Why dont I have heat on my 97? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-13-2005, 04:17 AM   #1
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Default Why dont I have heat on my 97?

Yesterday i though that the wind was just coming through the car a little but today it was freezing outside so now i can tell the diffrence. The heat comes out just a little like the temp is on like 75-80 degress. Could this just be the thermostat because the car isnt over heating or the worst.................the HEATER CORE ?

The car isnt over heating or antifreeze hasnt leaked so what can this be. I can feel it coming out the vents but just a little.
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Old 03-13-2005, 07:09 AM   #2
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Default Re: Why dont I have heat on my 97?

Quote:
Originally Posted by 1993bonnie
Yesterday i though that the wind was just coming through the car a little but today it was freezing outside so now i can tell the diffrence. The heat comes out just a little like the temp is on like 75-80 degress. Could this just be the thermostat because the car isnt over heating or the worst.................the HEATER CORE ?

The car isnt over heating or antifreeze hasnt leaked so what can this be. I can feel it coming out the vents but just a little.
Assuming the coolant level is up (did you check the level of coolant in the radiator, too?) you may have a bad heater core or a bad airmix door actuator. There are a lot of posts on these problems, and some excellent approaches (I think by RMac) to remove the heater core and/or airmix door without removing the dash if it comes to that.

You should be able to determine if the heater core is the problem by feeling the heater hoses. In a good heater core, one hose will be hot, and if the heater fan is on, the other hose a little cooler as some of the heat is removed to the cabin of the car. But, both hoses will be pretty warm, as the coolant freely flows through. If the core is plugged up letting just a little coolant through, the feed hose will be hot and the return hose will be cool or cold. So if both hoses are hot, your heater core is probably OK, and the problem is that the door in front of the heater core is not opening allowing air to pass through the core and into the ductwork. If that'* the case, you are probably looking at the door problem.

I'll try to find some links for you.
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Old 03-13-2005, 07:22 AM   #3
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Here'* the link:

http://www.bonnevilleclub.com/forum/...ght=A&start=20

RMac should get an award for figuring this out.

And, when you say heat is coming out just a little, are you referring to airflow or temperature? If it is low airflow, then the problem is probably the blower motor.
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Old 03-13-2005, 11:57 AM   #4
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Or if the airflow itself is just low, the air passages through the core are dirty, and the core cleaning Techinfo article is for you. That was my problem.
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Old 03-13-2005, 09:54 PM   #5
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I vote for either low coolant level or a suck open thermostat. I hate real work/problems.
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Old 03-13-2005, 10:14 PM   #6
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Quote:
Originally Posted by Ol' Timer
I vote for either low coolant level or a suck open thermostat. I hate real work/problems.
You're right, Ol'Timer, should have mentioned to check the temperature as an indication of a bum t'stat. Thanks for the save!
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Old 03-14-2005, 09:25 PM   #7
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I CHANGED THE T-STAT AND ADDED COOLANT -NOTHING! i CHECKED THE HEATER CORE HOSE AND ONE WAS WAMER THAN THE OTHER SO I GUESS THAT IS OK. wHATS NEXT. iT CAME OUT A LITTLE WARMER TODAY BUT IT MITE NOT TOMORROW. tHE AIR CONDITIONER ISNT EVEN WORK NO MORE. IS THERE A FUSE FOR THIS PROBLEM LOL?
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Old 03-14-2005, 11:36 PM   #8
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Quote:
Originally Posted by 1993bonnie
! i CHECKED THE HEATER CORE HOSE AND ONE WAS WAMER THAN THE OTHER SO I GUESS THAT IS OK.
Maybe not. I just made a few tests on my '95 to make sure I was not leading you astray. I have a good heater core and am running a drilled 180 degree thermostat.

Check for airflow: Turn heater control to full hot; turn function to hot feet; turn fan on low, put hand on floor by heater duct outlet. Increase fan speed and determine if more air is flowing at each higher setting. If the airflow is poor at all the settings, you either have a ducting problem or very dirty fins on the air side of your heater core. If the airflow increases normally but the air is cold, do the next tests.

BE CAREFUL that you keep your hands clear of the alternator blades, pulley and belt! Tie back your hair, roll up your sleeves and take off your watch so stuff won't get caught in pulleys.

Condition A: With the engine fully warmed up (temp gauge showing about 180 on my car) heat control is turned to full hot; fan is on the lowest setting; heater function set to hot feet. Result: the top hose out of the tensioner assembly feeding the heater core is hot, return hose is hot too, maybe just a little bit cooler than the top hose.

Condition B: engine fully warmed up; heat control to full hot; heater function set to hot feet; fan on highest setting; Result: top hose hot; return hose becomes noticeably cooler than feed hose, but is still warm.

If you test under condition A and return hose never gets warm, that tells you the coolant is not flowing freely through the heater core and you probably need to change the heater core.

The temperature of the air coming through the heater core in the car won't be any warmer than the coolest hose you feel. If that return hose is not hot, the heater won't blow hot either.

Now there can be one more issue. If you changed the thermostat, are you sure that you bled all the air from the system using the little screw on top of the thermostat housing?
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Old 03-15-2005, 02:05 AM   #9
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Ok I didnt bleed it how is that done. Also one heater hose is hoter than the other. Since were talking about hotness, are we saying that those hoses aresuppose to be as hot as the radiator to the t-stat hot or like warm/hot that we can keep our hand on kind of hot?
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Old 03-15-2005, 03:22 AM   #10
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I found how to bleed it but that wasnt the problem. And i also warmed up my 93 and the hose felt like they where they same temp as the 97.Only thing is that that one doesnt have ac like the 97 but that wont comeon either. Any suggestions!
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