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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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#87 of 109 Re: Bebensee [bbebensee] by B4UBuy Jan 15, 2009 (6:24 pm)
Replying to: bbebensee (Jun 30, 2008 4:46 am) The problem with your rear heater is the doors that were used in most of those units. They were out of spect and were still used. The whole rear unit needs to be removed and either have the doors replaced or regrease the holes and the door pins. It takes about an hour or two if you do it yourself. Depending on your mileage it should be under warranty. I hope this helps.
#88 of 109 Re: 1998 GMC Yukon heater problem [bobvanleeuward] by arrie Jan 16, 2009 (2:58 pm)
Replying to: bobvanleeuward (Dec 11, 2008 2:21 pm) Make sure you have enough engine coolant level. Best way to check this, which is against what they say, is to open the engine coolant expansion reservoir after running the engine hot.   By opening I mean to place a thick shop rag on top of the cap and turning it slowly open to let pressure out from the reservoir. Pressure comes out when the spring loaded valve on the cap opens and lets vapor pressure out thru the drain line. This means that the cap is still on the threads but still be careful not to get hot liquid on yourself.   Allowing vapor pressure out from the engine will let the cooling system to fill all the way. If your engine is not filled all the way you will see the level drop in the reservoir.   I'm writing about this because it happened to me. I still had some level in the reservoir but was able to add almost 2 gallons of coolant to get level really up to the reservoir. Somehow this cooling system can get air bound and keep coolant from filling in the engine, which should never happen.   If coolant level is too low you will not have enough flow thru the heater core and you will see thing happen like it heats when you rev-up the engine but then does not when on idle or during low rpm driving.   Arrie
#89 of 109 Arrie is right on the mark by rikkitikki Jan 18, 2009 (12:37 pm)
I just bought a 2004 Tahoe for my wife, we could start her car and let it idle forever with no heat. Anti-freeze level appeared correct in resavoir, added 1- 1/2 gallons of anti-freeze and Bingo, now heat will drive you out of car........ Thanx for the tip.......... Replies to this message: arrie (Jan 18, 2009 10:03 pm) arrie (Jan 25, 2009 8:37 am)
#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...

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