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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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#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)
#31 of 109 Re: 2001 Yukon XL A/C blows hot air....sometime [delay275] by lpfeifer Sep 30, 2007 (7:02 am)
Replying to: delay275 (Sep 29, 2007 11:16 am) You never said if the compressor is running when the hot air is blowing?? Also, there is a switch for low freon on the silver canister for the air conditioning on the right side under the hood. You can pull off the wire connector and jump it with another wire to see if it is sensing low freon and not allowing the system to work. How many miles? Lyle
#32 of 109 Re: 2002 YUKON DENALI A/C, HEATING ISSUES [fred_pgh] by lpfeifer Sep 30, 2007 (7:09 am)
Replying to: fred_pgh (Sep 06, 2007 12:28 pm) Sounds like your compressor is gone, or at least the clutch that kicks it in and out. Lyle
#33 of 109 Re: 2007 Yukon Denali a/c problem [jpw5] by jlflemmons Oct 07, 2007 (8:34 pm)
Replying to: jpw5 (Sep 21, 2007 11:23 am) Under the hood, pull the A/C fuse and wait about 10 minutes. Put it back in and start the car, put the A/C in the 'auto' mode. It will act a bit weird for a few minutes, then it should straighten out. This is the exact same scenario I went through when replacing the battery on my '04. Pulling the fuse forces the ventilation computer into a hard reset and self learn mode. Haven't had a problem one since doing this a month ago. Replies to this message: mefixit (Jul 26, 2008 7:13 am)
#34 of 109 2002 Yukon XL Denali No Heat problem by fivebyfive Oct 30, 2007 (1:38 pm)
My heat has not worked for several months now, but with cold weather coming I need to get it fixed. A/C works fine for cooling when weather is hot.   I recently had a new water pump and t-stat installed as part of a non-related repair, but no-heat problem was not solved. Operating temps seem to be within normal parameters. Water supply line to heater core is very hot, return line is ice cold. Possible plugged inlet to heater core? Seems possible, but not probable. Somebody suggested that I look at the actuator(???). Any other suggestions?
#35 of 109 Re: 2007 Yukon Denali a/c problem [jpw5] by dreabt Nov 30, 2007 (6:40 am)
Replying to: jpw5 (Sep 21, 2007 11:23 am) Hi my name is Andrea, My Yukon is doing the same thing. I was wondering did you ever get your fixed and if so what was the problem. Please inform me because I have not had my Yukon for 4 months and the dealer is about to get it all. Replies to this message: rayb6 (Dec 08, 2007 7:55 am)
#36 of 109 Re: 2007 Yukon Denali a/c problem [dreabt] by rayb6 Dec 08, 2007 (7:55 am)
Replying to: dreabt (Nov 30, 2007 6:40 am) Picked up vehicle last Sunday with 300 miles on it. When I restart my 2007 Yukon xl (Not Denali), my heat only comes on after I change the heat settings a few times. The temp gauge is up to near 210 but no heat. I have to adjust the flow direction. Went to the dealer yesterday and they said it was normal. Any suggestions would be helpful.
#37 of 109 Re: Reprogramming Air Conditioning [jlflemmons] by fireballs Dec 14, 2007 (8:56 pm)
Replying to: jlflemmons (Aug 01, 2007 8:16 pm) jlflemmons-   Thanks for the great tip! I recently replace my battery on my '04. Well, when heater is turn on the passenger side blows Hot air but, the driver side blows Cold air; "very cold".   I called the dealer and they didn't have a clue but wanted to keep my GMC for a few days.   I think your reprogramming will reset the system. . .thanks --Los Angeles, CA Replies to this message: eodman (Dec 18, 2007 5:45 am) lpfeifer (Dec 18, 2007 7:34 am) eodman (Dec 18, 2007 2:21 pm) and 7 more... fireballs (Dec 23, 2007 12:18 am)

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