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GMC Yukon Climate Control AC and Heat Questions

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

You are in the GMC Yukon Forum. Your Hosts are steve_ & tidester

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

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#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.
#106 of 109 air condition one side heat the other ? by 05z71ma Sep 05, 2009 (4:39 am)
Yesterday I purchase and had installed 4 new tires, had an alignment,and a complete brake job done on my 2005 z71 suburban; it was like driving a new vehicle. Shortly after I hit the road from NTB I put on the air conditioning and noticed that I had cool air conditioned air on the driver side and heat from the passenger side. Does anyone have any advice? Could the air pressure sensors in the wheels effect the electrical system and confuse climate control? Are there any components that the service tech could have messed with?
#107 of 109 Re: AC and Heat at same time? [mcdaddy1956] by jbast Oct 02, 2009 (11:51 am)
Replying to: mcdaddy1956 (Aug 18, 2009 2:01 pm) mcdaddy,   I was wondering if this fix is still working for you. I'm about to buy an '04 yukon in phoenix and a/c is super critical. I experienced this prob on a test drive yesterday. was gone after a restart but won't always be able to pull over. If good, can you give me some clues on harness/colors so I pull the right one??...   thanks,   Joe Replies to this message: needlenose (Oct 02, 2009 12:16 pm) tidester (Oct 02, 2009 3:30 pm)
#108 of 109 Re: AC and Heat at same time? [jbast] by needlenose Oct 02, 2009 (12:16 pm)
Replying to: jbast (Oct 02, 2009 11:51 am) Finally solved my a/c problem; tried a several things, like removing battery terminals and holding them together to drain residual voltage from processor, etc. Ended up that after removing neg terminal and putting it back in place, I turned on key, BUT DID NOT START THE YUKON. Waited a couple of minutes to let it re-program itself, then started it up. At that point, all is well. Hope this helps!! Replies to this message: tidester (Oct 02, 2009 3:30 pm)
#109 of 109 Re: AC and Heat at same time? [needlenose] by tidester HOST Oct 02, 2009 (3:30 pm)
Replying to: needlenose (Oct 02, 2009 12:16 pm) I am glad that worked out for you and thanks for sharing.   One minor point, however, you did not remove the battery terminals. You removed the battery cables. That's just so no one tries something dangerous.   tidester, host SUVs and Smart Shopper

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