Question about GMC Yukon

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Sometimes my ac unit goes froming blowing cold to hot air then shuts down. It only happens every few weeks....when I get in the car the next morning....it's works perfect. The unit in the back for the passengers works fine.

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Sounds like the front side tempeture door actuator is faulty.
You can take it to a good repair shop and have the HVAC controller scanned for codes. It may help in diagnosis, but I would suspect the actuator.

Hope that helps.........

Posted on Jul 21, 2008

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AC works for about 300 miles then stops and blows hot air. New AC compressor and freon charge. After sitting for a while it will again blow cold.


I think you have a similar problem to mine. At highway speeds is when it happens. And it is not blazing hot? Right?
Your evaporator is freezing up - as this happens the ice surrounding it prevents the flow of air over the evaporator coils and the result is warm air coming out of the registers. If I turn off the AC for about ten minutes and let unit melt the cold air comes back. This does not occur in stop and go driving.
I combat it by either running the fan at a higher than normal setting to increase air flow over the evaporator and then turning off when it gets too cold, OR using the air control to allow warmer outside air to enter into unit at highway speeds to prevent freezing up.
Newer cars have more sophisticated sensors and controls to prevent this but some older vehicles are subject to this anomaly.
Since it works fine under normal conditions I have not messed around with the freon level in system. If you release a tad of refrigerant the low pressure switch will shut off the compressor sooner and help minimize ice buildup. Good luck.

Aug 19, 2016 | 2000 Ford Taurus

1 Answer

94 Buick Roadmaster AC fan blowing hot and won't shut off


If you have climate control it could be the main processor. Something could be shorting the blower relay to keep it on. You would also need to check and see if the system is still full of freon.

Jul 06, 2013 | Cars & Trucks

1 Answer

2006 magcab ac stopped blowing out cold air olny hot air blows out of vents


check the freon charge for the a/c system to low can shut off the cutch

Jul 13, 2012 | Cars & Trucks

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Air cinditioning wont stay on, it switches to heat and wont shut off


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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1 Answer

HY MY NAME IS DUANE AND I NEED HELP FIGUREING OUT WHY MY AC WORKS GREAT IT'S BLOWS ICE COLD AND SOMETIMES IT BLOWS HOT IT JUST STARTED A FEW DAYS AGO WHAT DO THINK IT MIGHT BE? THAKS YOU


it may be that the clutch on the A/C compressor is faulty & sometimes it doesn't engage or it could be a wire is loose or a loose connector plug, next time it blows hot air when it should be cold lift the hood & make sure that the clutch on the A/C is engaged ......hope this helps......cheers.

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2 Answers

1999 Ford F150 AC fully charged with freon is blowing hot air


there are few things you need to check out:
1. if the compressor is overcharged it will shut down and you won't get any cool air
2. the thermostat for your cooling system is bad
3. the link to adjust the temperature is too short (did you feel the switch loose when changing temperature from hot to cold)?
hope this helps.

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1 Answer

I have a 1993 Acura Ledgend. For some reason my heater does not continue to blow hot air, it does for a few minutes and then begain to blow cold air. It does this often now. It works and then it blows cold...


first check to see that you coolant level is full, check it after the engine has cooled down,so there is no pressure in the system. otherwise you possibly have a head gasket in the early stage of failure

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1 Answer

AC sometimes does not blow cold


recharging wouldtn hurt, a mechanic can tell you the level and if needed, but check also your serpentine belt, it might just be loose and worn and not engaging the condenser properly.

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1 Answer

Drivers side AC will blow hot air.


the blend motor on the vehicle is probably bad

Aug 20, 2009 | 2003 Chevrolet Silverado 2500HD

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