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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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#96 of 109 AC and Heat at same time? by jking5 Jun 24, 2009 (2:19 pm)
When the AC on my 2004 Yukon XL is running, sometimes the heat comes on...just on one side, while cool AC continues to blow from the other side? Any suggestions besides taking it to the dealer's. Warranty has run out and can't afford their rates. Replies to this message: arrie (Jun 25, 2009 12:57 pm) kmimobile2 (Jun 28, 2009 7:17 pm) mcdaddy1956 (Aug 18, 2009 2:01 pm) jking5 (Aug 18, 2009 4:38 pm) jbast (Oct 02, 2009 11:51 am) and 2 more...
#97 of 109 Re: AC and Heat at same time? [jking5] by arrie Jun 25, 2009 (12:57 pm)
Replying to: jking5 (Jun 24, 2009 2:19 pm) I have posted about this before a couple of times. I had the same problem with my '04 tahoe and I fixed it by disconnecting the A/C control unit wire harnesses.   Easy job to do. Take the bezel out and unscrew the 4 screws. You need to hold the clips on both sides to pull the controller out. Disconnect harnesses at the same time and then replace all.   Worked for me.   Arrie Replies to this message: kmimobile2 (Jun 28, 2009 7:17 pm) mcdaddy1956 (Aug 18, 2009 2:01 pm) jking5 (Aug 18, 2009 4:38 pm) jbast (Oct 02, 2009 11:51 am) needlenose (Oct 02, 2009 12:16 pm) and 1 more...
#98 of 109 Re: AC and Heat at same time? [arrie] by kmimobile2 Jun 28, 2009 (7:17 pm)
Replying to: arrie (Jun 25, 2009 12:57 pm) Thanks for the help. Pretty straight forward job except for disconnecting wiring harnesses. Not a lot of room to work with. Blower is working fine at the moment.
#99 of 109 Rear ac problem by nana15 Jul 15, 2009 (3:31 pm)
I have a 97 yukon, the rear cool air stopped working and the front does not seem to blow that cold. I have had coolant put in and it checks fine.The rear just blows hot air,it is ac only in the back. Can someone help?
#100 of 109 99 gmc yukon a/c by coachfields Jul 26, 2009 (7:00 am)
Problem:   My rear A/C blows really cold regularly and the front blows cool for only a couple of days after a couple cans of 134A.   Question:   Is there a leak? Are my valves clogged? Or does something need to be replaced?   Any advice would be greatly appreciated!   Thanks,   Coach
#101 of 109 Re: AC and Heat at same time? [arrie] by mcdaddy1956 Aug 18, 2009 (2:01 pm)
Replying to: arrie (Jun 25, 2009 12:57 pm) All I can say is A-W-E-S-O-M-E!!!!!!!!!!!! My son has a 2004 GMC Yukon and first it had a short in it that was draining the battery. I got that fixed. Then the speedometer cluster went out. $600 at GM to fix it, but I found a guy on E-Bay that fixed it for $64. (Brian's Speedometer Shop-Muldrow, OK) Now the AC was blowing hot air out the driver's side and cold air on the passenger's side. I just went out and took it apart and unplugged the harnesses on the back of the AC control and it works GREAT! Thank you very much! Replies to this message: jking5 (Aug 18, 2009 4:38 pm) jbast (Oct 02, 2009 11:51 am) needlenose (Oct 02, 2009 12:16 pm) tidester (Oct 02, 2009 3:30 pm)
#102 of 109 Re: AC and Heat at same time? [mcdaddy1956] by jking5 Aug 18, 2009 (4:38 pm)
Replying to: mcdaddy1956 (Aug 18, 2009 2:01 pm) Is this something so simple a layman can do it? I'm not sure I'd know what a harness is?
#103 of 109 1994 yukon a/c by rootman2 Sep 03, 2009 (6:27 pm)
here's the problem. my a/c work's fine until it gets hot out side and the inside of the suv gets hot. Then the a/c wont get cold. It works on not so hot day's. help me. Im going to the Mojave desert next week. Replies to this message: arrie (Sep 04, 2009 8:30 am)
#104 of 109 Re: 1994 yukon a/c [rootman2] by arrie Sep 04, 2009 (8:30 am)
Replying to: rootman2 (Sep 03, 2009 6:27 pm) From what you say it sounds like your A/C system refrigerant charge is low.   To check for this you would need to have refrigerant pressure checked. Normally this is easy by running the engine with A/C on MAX cool and check the pressure in the low side service port but as your truck is 1994 model it could be more complicated as you might still have the old R12 refrigerant system. I'm not sure if pressure gauges etc. are available for that system to buy without a permit.   If you have the R12 system you should have it converted to 134a system, which you can service yourself.   If you have the 134a system get a pressure gauge from a parts store. Check pressure and if low charge system but first add oil charge as it is an old system. You might also want to add a charge with O-ring conditioner as if you are low in charge then you must have a leak somewhere.   Add refrigerant until pressure is at required level.   Arrie
#105 of 109 Climate Control Issue 2005 yukon by needlenose Sep 04, 2009 (9:55 pm)
I am new here; I have been reading up on climate control issues after battery reconnect. I have tried removing Neg batt terminal to reset; would next like to try to reset module by pulling fuses. There are several that refer to front, both under hood, and on side of dashboard. Does anyone know the exact fuse that I should pull to attempt this reset. My system is blowing heat only, and I have no control over where the heat exits. Rear air is just fine.

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