- #10 of 109
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97 Yukon - AC & heat sporadically failing, for years...
by lousyac
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Aug 03, 2007 (9:30 am)
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Replying to: ccryder (Oct 19, 2006 2:54 am)
I've got a 1997 GMC Yukon (bought in 2001). Anyways, it's always had this problem: the fan starts blowing, I can feel the faintest leak of hot or cold air out of the vents, but no air comes out of the vents. This is an intermittent problem. Sometimes it works fine, sometimes it doesn't. No telling when it will fail or when it will work.
Of course, over multiple trips to the mechanic it has worked every single time for them.
This is driving me nuts! At this point, if there's a part that's a likely culprit I'll just buy it, hand it to the mechanic and have him replace the !#$ thing. Does anybody have any ideas what could be failing that would keep that nice cool (or hot) air from getting all the way into the cabin ?
Thanks in advance,
Pat
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- #14 of 109
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Air Conditioning malfunction
by joesdenali
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May 30, 2007 (7:16 pm)
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Replying to: lousyac (Aug 03, 2007 9:30 am)
I have a 2004 Denali that blows heat and A/C through the defrosters only. The dealer has "adjusted" some sensor three times based on the TSB recommendations. What should I do??
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- #15 of 109
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Re: Air Conditioning malfunction [joesdenali]
by beu
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Jun 10, 2007 (1:10 pm)
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Replying to: joesdenali (May 30, 2007 7:16 pm)
Probably a vacuum leak to the vacuum controls of the HVAC if it has vacuum controls instead of electrical. The defroster is the default if there is no vacuum. Does it idle rough?
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- #16 of 109
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Re: Air Conditioning malfunction [beu]
by duke5259
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Jul 08, 2007 (7:46 am)
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Replying to: beu (Jun 10, 2007 1:10 pm)
I have this same problem and I do have a bit of a rough idle. Any ideas where to start troubleshooting the vacuum system?
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- #17 of 109
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Reprogramming Air Conditioning
by cheapengineer
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Jul 17, 2007 (8:02 pm)
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Replying to: lousyac (Aug 03, 2007 9:30 am)
The A/C in my 2004 Yukon XL wasn't getting cold any more. I figured it was a basic freon leak. Dealer said the control module needed to be re-programmed. Charged me 2.5 hours labor at 95 $/hr. They could not explain what went wrong or why it needed to be reprogrammed, they just said that is what needed to be done.
Did I get duped?
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- #18 of 109
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Re: Reprogramming Air Conditioning [cheapengineer]
by jlflemmons
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Aug 01, 2007 (8:16 pm)
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Replying to: cheapengineer (Jul 17, 2007 8:02 pm)
Ouch. I had the A/C computer go wacky after changing the battery in the '04 this past weekend. Passengers side front blew cold, rear blew cold, drivers side hot. Dealer offered to 'reprogram' system.
Well, I work with computers every day, and I know that unit must have a "self-learn" function. So, I went to the fuse box under the hood, pulled the fuse to the A/C control system. Waited a few minutes, reinstalled the fuse, and started the car, and within one minute the system reset and started working correctly.
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- #19 of 109
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2001 yukon denali rear A/C problem
by motrcop2000
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Aug 01, 2007 (9:28 pm)
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Replying to: lousyac (Aug 03, 2007 9:30 am)
I put a new condenser, front and rear dryer, evaporator, and compressor on the A/C and had the system charged. Besides being a pain in the butt of a job, the rear A/C fan no longer kicks on. I checked the large gray fuse and small 10amp fuse under the hood and both are good. I have tried kicking on the system by pulling the fuse, waiting, and then replacing and got nothing. I tried to turn it on using the auto button front A/C control, rear A/C control and rear A/C auto and I get no air at all you can't even hear the fan kick on. The front A/C works great, never better. WHAT AM I MISSING?
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