Question about 1998 GMC Sonoma

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Can not get any heat. AC is working properly - 1998 GMC Sonoma

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The easiest part to replace is the thermostat. This where most problems seem to occur.

Posted on Apr 05, 2011

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1 Answer

My blower works fine and the mechanism under the dash is working properly when switch from AC to heat. It won't blow warm air at all. Anybody have any suggestions on what to check next?


Does the engine reach normal operating temp? Are the heater hoses hot? Another thought, maybe temp door under dash has a problem?

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Check if it is smoke or steam, if it is smoke do not start the car, if it is steam disconnect AC and go to a mechanic.

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You need to ensure the engine is running when you are testing the AC or heating systems, as they rely upon a compressor to work the heat pump.

If your engine is on when you are testing this and no different temp air comes out, you should ensure your AC system is properly charged with coolant and that the compressor is engaging and functioning. If not, it will need to be replaced.

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PROBABLY THE DOORS ( THAT CHANGE FROM HEAT TO COOL ) ARE NOT WORKING PROPERLY CHECK IF THEY MOVE PROPERLY.

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The actuator door that is behind the dash that closes off the heater core from shooting hot air thru the vents might be your problem. When you turn on your ac the actuator shuts the door to prevent the air from flowing thru the heater core into the cabin, this may be your problem if everything else is working properly. Let us know.

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No heat when you set the controls for heat. AC and blower are working fine.


Possible bad thermostat, or your blend door is not working properly.

Oct 03, 2011 | 1998 Chrysler Cirrus

1 Answer

Heat/air vents seem clogged. No air coming through in any setting (AC, heat, circulate).


I had similar problem, thought fan not working properly, found that pollen filter choked up, replaced it and works fine now.

Aug 02, 2010 | 2005 Toyota Corolla

1 Answer

CANT ADJSUT THE CONTROL ON HEATER AND AIR


The controls for your heater/vent selection is inside the dash, behind the control switches you use to select the vents the heat/AC will come out.
When you move the selection levers, there's a few things that happen. Vacuum is applied to the doors (which are inside) and they open or they work using cables to move the doors or both. The different doors open, directing air flow to the vents selected.
Remove the controls from the dash (which should just be removing some screws, maybe a few small pieces of dash and pulling it out). The controls will be connected inside so they will not come out very far.
Just check to see if anything is disconnected and try operateing the controls with the heat on to see how they work.
Sometimes they just stick or the doors stick. This system is the way the 1991 models worked but since they are the exact same, it should be this way also.
Look it up in some sort of repair manual for more info. I find with these trucks, they don't heat very well using the front vents anyway. I find using the bottom vents work best for heat unless you need defrost.
The "heater" selection will atomatically use the bottom vents, "bi-level" AC will use the front and bottom vents if I remember right and regular AC will automatically use the front vents. For the trouble in removing these controls (the whole dash would need to be removed for repair) I probably would just live with the way they work if they do work atleast properly (enough heat and AC). If you find that you don't get enough heat or AC when in use, check the cooling system for proper operation and blockages/mineral buildup and check the AC system incase it needs recharging or you have leaks.

Apr 12, 2009 | 1992 GMC Sonoma

1 Answer

Heat /ac fan doesn't work properly


Check the relay for the blower. it may be locked . tap it lightly or jiggle the relay or check with a known good relay.this two circuits may be interconnected. check the light relays as well and fuses.

Nov 30, 2008 | 2002 Pontiac Grand Prix

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