- #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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- #23 of 109
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Slightly different AC question
by kuzkuz
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Aug 14, 2007 (2:18 pm)
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Replying to: lousyac (Aug 03, 2007 9:30 am)
Hey guys...I have a slightly different problem on my 03 Denali, and wanted your input.
When I turn on the AC, the motor is actually making a sound. It sounds like something might be caught in it, but it's a humming sound, and I don't know how to go about diagnosing it.
Also, there is a clicking sound, but ONLY when it's on the direct ahead placement. Whenever air is directed to my feet or the defroster, the sound goes away. I'm sure a dealer will scerw me, so I wanted your input. Thanks!
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- #24 of 109
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A/C question on 2001 Yukon XL
by jrooking
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Aug 18, 2007 (12:33 pm)
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Replying to: lousyac (Aug 03, 2007 9:30 am)
Hey Guys..I have a problem with the a/c unit on my 2001 Yukon xl.
I change out the a/c belt and the belt tensioner becouse they were worn out.When i turn on a/c all was good while at adl,but when i accelerate the belt tensioner would jump,bounce,and make a clamping noise.
Just don't know what to cheak for now,any ideas were to start trouleshooting next or what to look for?
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- #25 of 109
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Re: A/C question on 2001 Yukon XL [jrooking]
by jlflemmons
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Aug 21, 2007 (6:07 am)
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Replying to: jrooking (Aug 18, 2007 12:33 pm)
Sounds like the belt may be defective. If the belt has a hard or soft spot, it will flex at different rates as it goes around the pulleys. At idle it isn't so noticeable, but at speed under load, it can really make the tension pulley jump.
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- #26 of 109
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2002 YUKON DENALI A/C, HEATING ISSUES
by fred_pgh
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Sep 06, 2007 (12:28 pm)
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Replying to: jlflemmons (Aug 21, 2007 6:07 am)
I have an 02 Yukon with a host of heating and A/C problems. I don't know if they're related, so I'll start from the begining.
I started hearing a rattling noise from the engine compartment every time I turned on the A/C, which subsided after driving. Around that time, it was blowing hot air in the rear compartment. Then I began to hear the rattling even with heat/defroster. Finally, I'm getting hot air from the front. I checked the fuses and all appear good.
Any advice/help would be appreciated.
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- #27 of 109
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2007 Yukon Denali a/c problem
by jpw5
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Sep 21, 2007 (11:23 am)
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Replying to: fred_pgh (Sep 06, 2007 12:28 pm)
I have a 2007 Yukon Denali that is blowing warm air on the driver's side when temperature is at 60 degrees, (as low as it goes). It will occasionally "kick in" and blow cold air. It blows the normal cold air on the passenger's side all the time. I've taken it to dealer three times now and they can't figure out the problem. The first time to the dealer, they added freon. The second time, they replaced the actuator. The third time, they said they couldn't duplicate the problem and don't know what to tell me. It's still blowing warm to very warm air. This is very frustrating since I live in Texas. It's hot! Don't have time to run to dealership when hot air kicks in. I think they should have a way to troubleshoot this problem without having to "duplicate it" as they tell me. Any suggestions?
Thanks. Also, don't know if this matters. The battery went totally dead and was replaced approximately eight months after I took delivery of the car.
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