Question about 2008 GMC Yukon XL

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I have 2008 gmc yukon xl, ive replaced two compressors and i am on my third. makes a loud noise like doesnt want to engage blows cold then hot. and car shakes under hood makes crazy sounds. "snow flake" blinks

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Sounds like the compressor is ok, but the orifice tube may be plugged, making the high pressure side shoot up to too high of a pressure rather quickly. When the pressure on the high side goes down, then the compressor tries to turn on and circulate refrigerant again, but can't for long because of the restriction.

There could be metal filings from the older compressors which were replaced still in the plumbing. Will have to evacuate the system and replace plumbing parts as necessary.

Hopefully your compressor is covered by warranty, but I would not count on it if contamination from old compressors was not properly removed by the prior service.

I would try to get warranty service, though.


The 'snow flake' blinks showing a problem in the a/c system.

Posted on Aug 12, 2010

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Yukon a/c blows hot air


Assuming you hear some kind of clicking noise when you turn the AC on (the compressor clicking on):
Seals on the AC compressor likely bit the dust. GM AC compressors go out almost as frequently as tires. The good thing is that they're not horrifically difficult to replace. You can get some freon with dye in it at your local parts house. Get enough to fill it up as though it's empty (as it likely is), and see if it starts blowing cold. It should blow cold for a little while (days/weeks maybe), but when you open the hood, you'll notice some green dye around the compressor. That's where the seals have failed and why you get to be the proud new owner of a brand new compressor (don't waste your time on a used one from a salvage yard. You'll get to replace it again soon, if you do.)

Sep 02, 2012 | 2003 GMC Yukon XL

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I have a 2001 Yukon XL 1500. I broke an AC belt. I had the belt replaced and the system recharged. It now makes a noise when you accelerate after start up. But that is the only time. AC blows cold...


Actually,you both could be right.It may be the bearing inside the compressor.The compressor does not make the cold air,it helps pressurize the system to get the freon from the evaporator to the condenser.The evaporator provides the cold air.If you can,open your hood and have someone start your car.Have them give it some gas and see if you can pinpoint the noise more accurately.If your compressor bearing causes it to seize up,you will probably only get a couple of miles before your belt snaps.Another slight possibility is the tensioner.It's pretty rare but stranger things have happened.I did have a compressor seizure years ago and snapped a belt though.If you can pinpoint the noise it would help to know.If you can't I would like a better description of the noise though.Good luck! Greg

Sep 17, 2010 | 2003 GMC Yukon XL

1 Answer

I have 2008 gmc yukon xl, ive replaced two compressors and i am on my third. makes a loud noise like doesnt want to engage blows cold then hot. and car shakes under hood makes crazy sounds. "snow flake"...


You'll probably have to have someone hook up to the a/c system with the pressure gauges to see what is happening inside the system when it is running and also hook up the OBD II diagnostic connector at the same time to see why it's blinking the light. Often when a compressor has failed it will send a lot of ground up metal into the system which can plug both the condensor core and the expansion valve...both of which will then cause the high side pressure to be far too high and the system will turn off as a result. If it tries to run in this condition for any length of time it will damage the new compressor which then sends even more metal debris into the system as it fails. Good luck, hope this helps a bit!

Aug 06, 2010 | GMC Yukon XL Cars & Trucks

1 Answer

A/c is not blowing cold air in front but air is cool in the rear.


Hey M, the pressure could be nothing but "hot air" and not freon... (I had this same problem!!) I let off a bunch of pressure..(nothing but clear hot air!!) ..using a small flat punch..on the low pressure side... if freon on comes out right away..stop.. if nothing but hot air comes out.. keep letting it out until freon comes out,,, When mine started letting out freon,, I quit and tried the A/C again... and it has been working fine since.. Just my recent experience!!!!

Jun 27, 2017 | 2001 GMC Yukon XL

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Loud engine noise or knocking when AC on


Have your air compressor for your air tested. Sounds like its bad.

Aug 26, 2009 | 2003 GMC Yukon XL

1 Answer

2001 Gmc yukon xl a/c blowing hot most of the time but some times blows cool for a little while. pressure gage shows 100+ when I am told this should be between 25-65. The compressor does not seem to be...


the earlier GM trucks had a problem with the a/c systems
Compressors are junk, but this will usually break the a/c belt, and make a horrible noise right before that.
the pressure you have listed is not much help, there is a high and low side pressure. If they are both the same, then the compressor is not on or is not pumping (broke). The early yukons/suburbans/tahoes also had a problem with the a/c cycling switch. If yours has a brown band, replace it.

At Idle (depending on outside temp) Low pressure should be about 40 psi at idle and high side about 220....again this can change greatly by outside temp.
Another thing you may want to look at is of course a leak in the system, make sure its fully charged, and check the fan clutch.

Jul 13, 2009 | 2003 GMC Yukon XL

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2002 GMC Yukon blows cold air from the front, rear works fine


check you antifreeze level and make sure its full

Jan 26, 2009 | 2002 GMC Yukon XL

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