- #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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- #20 of 109
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Re: 2001 yukon denali rear A/C problem [motrcop2000]
by jlflemmons
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Aug 02, 2007 (5:58 am)
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Replying to: motrcop2000 (Aug 01, 2007 9:28 pm)
Are you getting voltage to the rear fan?
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- #21 of 109
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Good point!
by motrcop2000
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Aug 02, 2007 (11:40 am)
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Replying to: lousyac (Aug 03, 2007 9:30 am)
I got what your saying. The rear fan motor could have a short or could need replacement. I feel kind of stupid now. So where might I find the rear fan motor to test it? Is it in the headliner and if so where at?
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- #22 of 109
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Re: Good point! [motrcop2000]
by jlflemmons
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Aug 02, 2007 (1:35 pm)
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Replying to: motrcop2000 (Aug 02, 2007 11:40 am)
I don't know for sure, but usually a rear cooling fan is mounted near the rear evaporator, like drivers side in the rear quarter? It is easy to move air through the plenum to the vents, not so easy to find a place for the fan motor.
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