Question about 2004 GMC Yukon

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Why does my AC turn hot ?

My AC blows cold air then turns hot going down the road. If I trun the vehicle of then back on it goes back to cooling.

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  • GMC Master
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It is a problem with a pressure switch. There are 2 pressure switches, a high and a low pressure switch.

The maximum run time is when the pressure is in a mid-range and neither pressure switch cuts off. What is happening in your case is the pressure is either too high or too low after the A/C runs a bit.

You need to test the system pressure and see what the average pressure reads as. This will give you some idea of whether your system needs more Freon.

If the system is low, you need more Freon and you need to stop the leak. Now if your system is very low, it is probably contaminated with outside air. When you get outside air in the system, bad things happen.

Outside will compress and make pressure; but outside air will not work like Freon and it also contains moisture which will freeze and block passages. That condition requires a Vacuum purge of the system and fixing the leak, then refilling the system with Freon.

Some of the bigger autoparts chains will Loan(deposit required) the proper tools to do some of this yourself. BUT if misused, you could cause more damage than the money you would pay someone to fix this in the first place.

A minimum attempt. Get a bigger can of Freon with a gauge and leak stop inside the can. You may be able to boost the pressure and seal the leaks with the right type of product. It may work. Follow the instructions and see if you can salvage what you have.

Please rate my info.

Posted on Jan 09, 2013

  • Alan Ward
    Alan Ward Dec 27, 2013

    The above poster is incorrect. Your blend door actuator has is malfunctioning but can be easily fixed. I fixed mine in 20 minutes after YEARS of it messing up. See how to here==>http://www.tahoeyukonforum.com/forum/sho...

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SOURCE: heater goes from hot to cold

I WAS TOLD IN THE PAST TO GET RID OF THE ORANGE ANTIFREEZE AND PUT IN THE GREEN IN ALL MY VEHICLES CREATES MORE PROBLEMS THE IT CURES THIS IS BY A SHOP I TRUST.I HAVE A 95/98 AND 99 BLAZERS.I HAD PROBLEM WITH VERY LITTLE HEAT AFTER CHANGING THERMOSTAT. HAD TO GET AIR OUT OF LINES BUY RUNNING IT FROM COLD START WITH RADIATOR CAP OFF UNTIL THERMOSTAT OPENED AND LEFT IT RUNNING UNTIL I SAW NO AIR BUBBLES COMING OUT OF RADIATOR SEEMED TO CURE PROBLEM

Posted on Dec 20, 2008

SOURCE: blows hot and cold-restart and problem disappears for a while

you need a servicing of the ac condensor, also check that the blower is working or not. your problem will be solved by servicing the condensor.

Posted on Jun 20, 2009

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SOURCE: 2002 yukon denali XL ac doesn't blow cold air.

You are going to need an a/c compressor, the clutches are gone.

Posted on Jun 26, 2009

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SOURCE: AC trouble

the best way is to take it into an ac shop without a manifold gauge set adding freon is just a guess you have a leak because freon never wears out it just leaks out. also the right way to do it would require having your system vacuumed out for at least 30 min. to get out all the moisture and air.

Posted on Jul 18, 2009

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SOURCE: cooling fan relay location on a 2005 gmc sierra

Check the fan clutch operation. And also check for leaks.

Posted on Mar 05, 2010

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