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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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#56 of 109 Re: 2004 Yukon Rear Climate Control [bbebensee] by obyone Jan 28, 2008 (12:33 am)
Replying to: bbebensee (Jan 17, 2008 3:14 pm) You could disconnect your battery for 15 minutes to see if it resets. After I had replaced the rear evaporator core, the system needed to be reset for the rear controls to work correctly.
#57 of 109 Re: 2000 denali heater not working all the time [denali00] by obyone Jan 28, 2008 (12:33 am)
Replying to: denali00 (Jan 25, 2008 12:54 pm) Try and check your coolant level. If the level is low the heater will not operate correctly.
#58 of 109 2003 Yukon XL blows hot air when all controls are OFF! by rkg1 Feb 26, 2008 (8:55 am)
Has anyone else had this problem? We will get hot air blowing thru the front defrost vents (on top of the dashboard, right under the windshield), with all temp controls OFF.   We recently figured out that if we turn the A/C on and let it blow really cold air thru the regular front vents, then turn off the system - that the defrost vents will stop blowing the hot air.   Any advice????
#59 of 109 Re: 2007 Yukon Denali a/c problem [jpw5] by vegasmom3 Feb 29, 2008 (1:25 am)
Replying to: jpw5 (Sep 21, 2007 11:23 am) I'm having the same problem in my 2007 Yukon. Started almost immediately, been serviced two or three times...once they said they couldn't duplicate it so, out of luck. The next time it happened I drove directly to the dealership and they said how strange it was, they needed it overnight and said they replaced or adjusted some type of actuator or something. The next time they said they'd need it for a while to try to figure it out, as they were "stumped". By this time fall was coming and we haven't used the AC until a week ago...same old problem---cold as ice on driver side and hot hot air on the passenger???? Did you ever get an answer for this on your Denali? I am one more visit away from a Lemon Law Action... Thanks for any tips!!
#60 of 109 Re: 2004 Yukon Rear Climate Control [bbebensee] by cheapengineer Mar 01, 2008 (8:12 am)
Replying to: bbebensee (Jan 17, 2008 3:14 pm) I had the same problem on my 2004 Yukon XL. The HVAC worked fine in front but the back and overhead only put out cold air. It was fixed for free under warranty but it only took 20 minutes. They said that there was a bad connection.   Since then all of the A/C quit working. They charged $325 to reprogram the HVAC system. They couldn't adequately explain what was broken or what failed, it just need to be reprogrammed. My service contract did not cover this so I had to eat it. Not happy.
#61 of 109 Re: Reprogramming Air Conditioning [jlflemmons] by bbebensee Mar 03, 2008 (10:01 am)
Replying to: jlflemmons (Aug 01, 2007 8:16 pm) Does the A/C computer control the heating as well, will pulling the AC fuse do the same for the heating? Replies to this message: rkg1 (Mar 03, 2008 11:02 am) motery (Mar 04, 2008 12:13 am)
#62 of 109 Re: Reprogramming Air Conditioning [bbebensee] by rkg1 Mar 03, 2008 (11:02 am)
Replying to: bbebensee (Mar 03, 2008 10:01 am) That's a good question.   Don't know the answer. Sorry   When my defroster blows hot air (with all controls in the OFF position), I turn ON the a/c and let it blow cold thru the defroster and floor vents for a few minutes. Then i turn everything OFF and it stops the defroster from blowing the hot air.   Can't figure out why it's blowing hot air on its own, and I have no idea why blowing the a/c and then turning everything off, works either. ???? Replies to this message: motery (Mar 04, 2008 12:13 am)
#63 of 109 Re: Reprogramming Air Conditioning [rkg1] by motery Mar 04, 2008 (12:13 am)
Replying to: rkg1 (Mar 03, 2008 11:02 am) the same thing happened to me but i unplug the battery well that stopped it but now when i turn the A/C on the air is cold in the back but in the front it's wormer not hot but little wormer then the back ...   my mechanic said it might be fuse or a switch( I forget exactly what he named it) under the dashboard and it will cost me 200$ to fix it ... I’m confused now i might try you way and see what happen... you never know…   thanks,
#64 of 109 Re: 2004 Yukon Rear Climate Control [bbebensee] by tjustus May 11, 2008 (2:07 pm)
Replying to: bbebensee (Jan 17, 2008 3:14 pm) I am having the same issue... My rear climate control will blow out cool air, when I'm calling for warm-hot air. What came of your situation?? Also has anyone else had a similar issue and what was their experiences??   A separate issue... While blowing A/C the front vents start blowing HOT air. I have to turn the vehicle off for this to stop.   Problems we should not be having for this type of automobile.
#65 of 109 Re: 2004 Yukon Rear Climate Control [bbebensee] by tjustus by motery May 11, 2008 (9:39 pm)
they say it’s common problem for this kind of Suv’s after a few years on the road. Well i say Bull S**t. Anyway, there’s a “cheap” way to overcome this dilemma … you see the hot air pipes (there are two pipes coming from the compressor going to the firewall, you’ll find them on the right back corner two black rubbery pipes next to each other) these pipes are responsible for the hot air flow in your a/c when you disengage them use sparkplug to plug it, make sure it's pluged (don’t put it back in just set it away from any moving parts) that will stop the hot air and you’re a/c will start to get cooler than before, you put right back again in the winter. OR, you may unplug the battery for 10 min. then put back and see if the a/c is working well or not keep in mind that the ignition key must be on START during this process. Good luck, Note: you can do it yourself on a Sunday it will only take 20 min. to do it.

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