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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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#90 of 109 Re: Arrie is right on the mark [rikkitikki] by arrie Jan 18, 2009 (10:03 pm)
Replying to: rikkitikki (Jan 18, 2009 12:37 pm) So,   You have a leak!   You probably have the porous cylinder head cast problem that lets engine coolant to leak internally inside the engine.   I would get BAR's radiator leak fix and pour it in the coolant expansion reservoir. You really need to do something and this is the cheapest fix that I know that at least worked for me.   Arrie
#91 of 109 Re: Arrie is right on the mark [rikkitikki] by arrie Jan 25, 2009 (8:37 am)
Replying to: rikkitikki (Jan 18, 2009 12:37 pm) Little SCARY info for all readers with possible coolant leak.   A couple of days ago I went to check on the coolant level on my '04 Tahoe engine. I have posted before that after using Bar's radiator fix I stopped loosing coolant as when I look at level in the reservoir it has not gone down.   THIS WAS ALL WRONG! I STILL HAVE LOST COOLANT BUT LEVEL DID NOT GO DOWN IN THE RESERVOIR !!!!!!!!!!!!!!!!!   What I did was that while engine was running I opened the cap of the coolant reservoir and the level went down by 1 1/2" immediately when I broke the seal of the cap.   I did not have any steam come out from engine to the reservoir so I was not overheating or nothing like that but the engine definitely was not full of coolant in all cooling channels.   THIS IS VERY SCARY AS WITHOUT OPENING THE CAP OF THE COOLANT RESERVOIR YOU CANNOT SEE YOU ARE LOOSING COOLANT!   What probably causes this is a very poor design of the reservoir and its connection in cooling system. It probably is that too small tubing from the reservoir does not allow coolant level in the reservoir go down because the reservoir is sealed, i.e. cannot get air in for the coolant to flow out. The valve in the cap does not let air to flow in the reservoir, only excessive pressure out from it.   MY SUGGESTION TO ALL READERS WITH SIMILAR ENGINES (5.3 L) AROUND '03 - '06 YEAR MODEL DO THE CHECK, I.E. OPEN THE RESERVOIR CAP (BEING VERY CAREFUL) WHILE ENGINE IS IDLING AND SEE IF LEVEL DROPS DOWN.   I think I will disable the valve in the reservoir cap, i.e. make it so that reservoir can breath freely in and out. Perhaps there is a check valve that could be installed on the cap that would let air freely in but outgoing pressure would still need to work thru the valve in the cap.   Arrie
#93 of 109 95 yukon heat and a/c problem by cryptrobber69 Jun 02, 2009 (6:29 am)
ok, the blower still works,but the vent selection knob will not change where the air flows and the a/c snowflake light button does not turn on the a/c.when you hit the button to turn on a/c it feels like the vent just pulling in outside air.The recycle but also does not come on to recycle the cabin air.I have checked all fuses ,they are all good.all levels of the blower switch works,just not the position select switch or the buttons.please help!
#94 of 109 2001 Yukon front AC only works on "5" by betazeta57 Jun 18, 2009 (12:13 pm)
(1) Two months ago, the front AC only blew on "5", not 1 through 4. The rear AC works fine. Is it a switch issue!?   (2) Went out to the truck today and the AC blower was running when the truck was off, keys in hand?!?!   (3) I took out a 10 amp AC fuse and killed the front AC. Rear still works great.   What are your comments with regard to these three issues?
#95 of 109 2000 tahoe blower fan by kmimobile2 Jun 20, 2009 (7:02 am)
2000 tahoe 5.7 old body style. Blower fan just quit the other day. Have checked fan by straight wiring to 12 volts, it works. Replaced resistor and relay behind glovebox. Checked all fuses. Don't know where to turn now.
#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?

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