Question about 1995 GMC Sonoma

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My ac come on for a while and then starts blowing out hot air?

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  • GMC Master
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A/C systems are more complex than most people realise...
The Freon level must be sufficient to provide enough pressure to actuate the pressure switch on the low end line...
There is a relay that turns the coolent fans on...
a climate controle switch in the dash...
an electric clutch on the compressor
and a PCM to control this all...

If your Freon level is low this condition will arrise...
Have your service tech look it over... my first thought is freon level...

Posted on Sep 28, 2010

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What do you mean when you say it wont shut off? is it blowing hot air or do you just feel a lite flow of hot air even if you have the settings to cold?

If this is the problem that you always feel hot air at low flow and the ac goes to hot air then i would say one of two things, first if you have the selector to cold and you feel hot air then there may be a problem with the blend door, this door move to allow hot or cold air, the door may be broken or just a bad motor that controls it. keep in mind if the ac system shuts down for any reason the air then will be warm, it will be about the same temp as outside and maybe a little hotter.

this problem almost sounds like the ac compressor shuts off and then you are getting the outside air which is hot, there are many reasons for the compressor to shut off, it could be the compressor clutch heating up and disengaging , this would be due to a bad compressor clutch.

another reason is the fans are not working, the best thing to do is when the system starts to blow warm check and see if the compressor is running, start engine and look at the front of compressor, with ac off the front of it will not move, and then with ac on the front will spin, check it out and let me know, if it blows warm air and ac is not working then it may be compressor problem but if you are getting warm air and the compressor is spinning then it may be a door problem.

This is hard to check with out testing the system, so i listed a few things to check and let me know the out come. also the ac blows cold for how long before it gets hot air blowing out of the vents, good day.

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Could be other issues, but I would start with these.

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