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GMC Yukon Climate Control AC and Heat Questions

109 messages,  Last post on Oct 02, 2009 at 3:30 PM

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What is this discussion about? GMC Yukon XL, Chevrolet Suburban, Chevrolet Tahoe, Heating / Cooling, SUV

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#21 of 109 Good point! by motrcop2000 Aug 02, 2007 (11:40 am)
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? Replies to this message: jlflemmons (Aug 02, 2007 1:35 pm)
#22 of 109 Re: Good point! [motrcop2000] by jlflemmons Aug 02, 2007 (1:35 pm)
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.
#23 of 109 Slightly different AC question by kuzkuz Aug 14, 2007 (2:18 pm)
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!
#24 of 109 A/C question on 2001 Yukon XL by jrooking Aug 18, 2007 (12:33 pm)
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? Replies to this message: jlflemmons (Aug 21, 2007 6:07 am) fred_pgh (Sep 06, 2007 12:28 pm) jpw5 (Sep 21, 2007 11:23 am) and 6 more... lpfeifer (Sep 30, 2007 7:09 am)
#25 of 109 Re: A/C question on 2001 Yukon XL [jrooking] by jlflemmons Aug 21, 2007 (6:07 am)
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. Replies to this message: fred_pgh (Sep 06, 2007 12:28 pm) jpw5 (Sep 21, 2007 11:23 am) boglesbee (Sep 23, 2007 1:15 pm) jlflemmons (Oct 07, 2007 8:34 pm) and 1 more... dreabt (Nov 30, 2007 6:40 am) and 1 more... vegasmom3 (Feb 29, 2008 1:25 am) lpfeifer (Sep 30, 2007 7:09 am)
#26 of 109 2002 YUKON DENALI A/C, HEATING ISSUES by fred_pgh Sep 06, 2007 (12:28 pm)
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. Replies to this message: jpw5 (Sep 21, 2007 11:23 am) boglesbee (Sep 23, 2007 1:15 pm) jlflemmons (Oct 07, 2007 8:34 pm) mefixit (Jul 26, 2008 7:13 am) dreabt (Nov 30, 2007 6:40 am) rayb6 (Dec 08, 2007 7:55 am) vegasmom3 (Feb 29, 2008 1:25 am) lpfeifer (Sep 30, 2007 7:09 am)
#27 of 109 2007 Yukon Denali a/c problem by jpw5 Sep 21, 2007 (11:23 am)
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. Replies to this message: boglesbee (Sep 23, 2007 1:15 pm) jlflemmons (Oct 07, 2007 8:34 pm) mefixit (Jul 26, 2008 7:13 am) dreabt (Nov 30, 2007 6:40 am) rayb6 (Dec 08, 2007 7:55 am) vegasmom3 (Feb 29, 2008 1:25 am)
#28 of 109 Re: 2007 Yukon Denali a/c problem [jpw5] by boglesbee Sep 23, 2007 (1:15 pm)
Replying to: jpw5 (Sep 21, 2007 11:23 am) 2007 Yukon. Bought at Texan GMC in Humble. I have had several problems with my AC system. Like the problem you describe, I have experienced problems with the AC kicking in/out. No rhyme or reason. Please let me know if you have found a solution to your problem....dealership has proven less than helpful. Seems unreasonable to have these problems in a $40,000 vehicle.
#29 of 109 Re: 2007 Yukon Denali a/c problem [jpw5] by boglesbee Sep 23, 2007 (2:15 by kjchmay Sep 26, 2007 (2:05 pm)
I am also experiencing this same problem on my 07, with the dealerships lack of knowledge and attempt to just throw parts at it with no success. My theory is a mixing door is stuck for some reason as it will get hot when you run the temp up, but will not get cold when you run the temp down. It only is on the drivers side. I am going back to the dealership tomorrow for the third time. The next visit I may be tempted to drive it through their wall and give it back to them.
#30 of 109 2001 Yukon XL A/C blows hot air....sometime by delay275 Sep 29, 2007 (11:16 am)
Within the past 3 weeks have noticed a new glitch. When running the a/c it will sometimes blow hot air out of the front as well as rear a/c vents (it has dual a/c). I reading of other peoples issues, it seems like on their vehicles it's just the drivers side that does this. On mine, its left, right and rear. I've replaced the fuse and relay in the underhood fuse box, but the same symptoms exist. I've cycled thru the temp range thinking it's maybe a piece of crud in the mixing box jamming one of the doors, but that doesn't do anything. But if I turn the vehicle off for alittle while and start it back up and turn the a/c backon it works just fine. HOWEVER, (this is the weird part) the air is 5 degrees cooler than it's ever run before. On the day I baught it it put out 55 degree air and it's been that way ever since. I just chalked it up to "just the way it is". But now, when running properly, it puts our 48 degree air. I took it to our local auto air conditioner center and they couldn't find out anything wrong. They were unable to duplicate the issue and said that 48 degrees was supposed to be the norm, and they said that it was probably a bad mixing box and when I got good and tired of it flaking out for me to come on back and they'd replace it. He said that it was a bitch of an item to repair. After I left, I got to thinking, if hot air came out of the front because of a bad mixing box door issue, why was hot air coming our of the rear vents too. It has it's own mixing box. Just today if was flaking out again and I decided to see what the internet has to say about this anomoly. Other than this single issue and a replaced water pump I've had zero problems with my Yukon XL. I must be one of the lucky ones that picked one that wasn't a lemon.   If any of you have any insight as to what migh be my problem I'm all ears (eyes).   D Replies to this message: lpfeifer (Sep 30, 2007 7:02 am)

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