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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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#4 of 109
Re: Yukon XL automatic climate control problem. [lpfeifer] by ge_cco
Jan 25, 2007 (12:12 pm)
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Replying to: lpfeifer (Jul 20, 2006 4:40 pm)

I have a 2001 Suburban with auto climate control. It started acting differently at the end of summer . . . everything still works the same as normal, except that when the cabin temperature gets to where it should be, the system doesn't back off enough. The computer still controls the fan speed, directs the air to different vents, and blows hot or cold air as required. Now in winter, it eventually gets too hot in the car, but it's still blowing hot air. I turn the temperature control down to minimum and adjust the fan speed manually to the lowest setting, but the air temperature is too hot and the car keeps getting warmer. Same in summer - it would keep blowing cold air, and with the temperature control set to 82 and the fan on minimum, it still got colder in the car.
The thing is it's different from how it used to work, where it would control to the temperature that was set.
The dealer simply said that I need a new computer. But to me it seems like a sensor problem, because the computer is still doing everything that it normally does, except backing off when it reaches temperature. It's as if it can no longer sense the cabin temperature correctly.
Has anyone had any problem like this, and if so did you figure out how to fix it? Any thoughts would be appreciated.
Thanks
#5 of 109
Re: Yukon XL automatic climate control problem. [ge_cco] by lpfeifer
Feb 10, 2007 (12:54 am)
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Replying to: ge_cco (Jan 25, 2007 12:12 pm)

I believe if you look above your head and to the left while seated in the drivers seat, you will see a round plastic grill, about the size of a quarter. This should be your auto sensor. There is a fan in it that should have been making some noise for some time, almost like a sound over you speaker from the engine. I know I saw something on here about the part number and color code of this unit. I belive its about $25.00. Someone here took his out and cleaned and lubed it.
Update on my problem, it started again, not to work. I pulled the controller out and the plastic was somewhat melted again. It looks like the meatal tab that is suppose to come down hard and make good contact on the controler contacts was hanging up in the plug, creating a lot of resistance, causing the thing to heat at the contact point. I worked the metal contact down so it makes good contact, but the wires are now somewhat hard from the heat. Looks to have been a defective plug from the factory as I have never had this part out since new.
Good luck, Lyle
#7 of 109
Where is the ac water drain? by ccryder
Aug 26, 2006 (12:32 pm)
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Replying to: lpfeifer (Feb 10, 2007 12:54 am)

On my 2000 Yukon the carpet on the passenger side is wet all the way to the back seat. I think it is the ac drain stopped up. Not engine water, no antifreeze.
I have crawled under it but cant find it.
#8 of 109
Re: Where is the ac water drain? [ccryder] by edfresh2
Oct 18, 2006 (2:27 pm)
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Replying to: ccryder (Aug 26, 2006 12:32 pm)

I just got a 2001 Yukon XL with the same pblm. Did you ever get this fixed? I still have the warrenty so I WILL eventually get it fixed. Thx - Ed F.
#9 of 109
Re: Where is the ac water drain? [edfresh2] by ccryder
Oct 19, 2006 (2:54 am)
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Replying to: edfresh2 (Oct 18, 2006 2:27 pm)

It is in the back on the right. Behind the right rear wheel. THe one for the front is inside the right front wheel. Been a while now but I finally carried mine to a mechanic. THey had to take the cover off inside the car; to the right of the rear seats to get to it to unstop it. My front one was ok.
My problem was that I didn't know there were 2; one for the rear and one for the front. I thought everything worked from the front but there 2 complete systems, only one compressor tho.
#10 of 109
97 Yukon - AC & heat sporadically failing, for years... by lousyac
Aug 03, 2007 (9:30 am)
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Replying to: ccryder (Oct 19, 2006 2:54 am)

I've got a 1997 GMC Yukon (bought in 2001). Anyways, it's always had this problem: the fan starts blowing, I can feel the faintest leak of hot or cold air out of the vents, but no air comes out of the vents. This is an intermittent problem. Sometimes it works fine, sometimes it doesn't. No telling when it will fail or when it will work.
 
Of course, over multiple trips to the mechanic it has worked every single time for them.
 
This is driving me nuts! At this point, if there's a part that's a likely culprit I'll just buy it, hand it to the mechanic and have him replace the !#$ thing. Does anybody have any ideas what could be failing that would keep that nice cool (or hot) air from getting all the way into the cabin ?
 
Thanks in advance,
 
Pat

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