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GMC Yukon AC and Heat Questions



  • Air Conditioner suddenly switches to heat. Turn car off and turn back on and it fixes it. What is the problem?
  • Your situation might have a bad electronic door in vent. I forget what the name of the part is....From what I';ve read from others in here it is a very expensive fix. $1000-$1400.
    Entire dash needs to be removed.
    I'd sell the rig...
  • Hello,

    I have a 95 yukon with the same issue. Did you ever figure out a fix?
  • ok, I'm going to start this again. 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!
  • Yes my issue was resolved. I posted step by step a few postings back...
    It worked for me and several others, simply disconnecting battery for 30 minutes did for others.
    If your issue started after a dead battery, you need to re-calibate climate control systems memory.
    If issue just happen suddenly without battery problems, it more than likely the electronic door inside vent needs replaced. $$$$$
    I forget what that part is called.
  • Yes I just got it fixed today.My problem was a left temp door actuator(GM part # 89018365) Total cost to repair was $340 so i feel pretty good.
  • Good....lot of money but cheaper than most to fix in here...
    Did you fix it yourself? I've read the entire dash needs to be removed.. :mad:
  • No the GMC dealer did it but they gave me a break. They said that repair is usually $500
  • I have recently been having problem with the passenger side A/C. The rear A/C works, as does the driver's side, but the passenger side blows out VERY HOT AIR. Even when the entire unit is off (no heat, no A/C...just off), we can still feel hot air coming out by the floor. We've even shut the vents on the driver's side but can still feel the hot air blowing out. It's getting to the point where my radio/dashboard is getting warm/hot to the touch. Any ideas of what the problem could be?
  • I posted step by step instructions what worked for me.
    Go back few postings and see if it helps you.
    Harley :)
  • I can't believe it - it WORKED!!! Thanks a lot! You saved us a ton of hassle and $$$!!!!!!!!!!!!!!!!!!!! ;)
  • 2000 Yukon XL SLT i have the same trouble have you resolved this issue do you have any tips or are you still having this trouble
  • sneremsnerem Posts: 5
    This is the information that was given to me. It worked, and we have been having no more problems. Good luck!

    Owners need to re-program the climate control system which I did successfully.
    Disconnect A/C & HVAC fuses.
    Start and run for about 30 seconds, turn off.
    Install HVAC Fuse only. ( A/C fuses leave disconnected )
    Start and while driving turn on climate cold setting and run through the different controls, foot, vent, defrost etc. making sure the system is working properly several times.
    Turn vehicle off...
    Start and re-do sequence several times.
    Turn vehicle off.
    Install A/C Fuse
    Start while driving turn climate control on with A/C...
    These steps resolved the problem, re-calibrating climate control systems memory.
    Again, this should be a recall issue and thousands of loyal GMC customers are being charged $1,400 or more from dealers.
  • pfedpfed Posts: 1
    I have been having the same problem on my 03 Yukon XL with the A/C not shutting off when the car was turned off. I took it to the dealer where they charged me $417.64 to rplace the HVAC Control Module and repair wiring. One week later, my battery went dead and had to be replaced and they charged me $$137. I thought there must be a connection, but was told no. I have had numerous issues with this vehicle as well. I have always gone to the dealer. Now two weeks later, the bearing assembly needs replaced to the tune of $1300.
  • Another successful re-program of the climate control system. Thank you. I followed the steps to the T and everything is working fine. I'm sure you saved me hundreds. If I knew anything worth while about cars I would love to share. But I don't. Big help,
    Thanks Again
  • Your welcome !
    I also know little about working on new cars but refused to pay $1400 to dealership knowing this issue started because of a dead battery. Dealership knows hundreds of thousands of customers are dealing with this issue and you'd think they suggest the steps to correct I listed, they want $1400 for doing nothing.
  • tink6tink6 Posts: 2
    My fan will not blow air in the front unit even when putting fan to the max. Also when fan does work it may keep running after the vehicle is turned off. This is an intermittent problem but seems to becoming more regular. The rear unit works fine. Help any advice?
  • I haven't run into this problem...I had heat blowing in the front even when the unit was turned completely off. My boss's kid had problems with his fan still running long after his car was shut off (a Nissan), but I'm not sure what the problem was with that (I can ask her on Monday). Not sure if it would be the same problem you're having, but maybe that's a place to start. Sorry, wish I could be of more help.
  • tink6tink6 Posts: 2
    Thanks I'd appreciate it.
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