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GMC Yukon AC and Heat Questions



  • Surprise! My heater doesn't work. Had blend door accuators replaced last year and worked great ($600 p & l). Has been working, then all of a sudden just blowing lukewarm air. Accuators were new (bought them myself and installed by trusted mechanic). Anyway, I've tried pulling the A/C and HVAC fuses thing and running through the defrost, foot, etc... all that stuff and still lukewarm air. I haven't disconnected battery yet. Are there different steps for diff year models for the hard reset or recalibration or whatever they call it. I've read so many different things they are all starting to run together. Any info would be appreciated. Thanks
  • I have a 2004 GMC Yukon 2-wd and the heaters on the driver side isn't working. It only blows out freezing cold air yet the other vents work properly for heat.Can someone help me because it's freeeeezing right now. Thanks for your time in reading this post. :confuse:
  • I had the same problem on my 2004 Yukon. I had to have the left temperature actuator for that vent replaced for about $600 and it fixed my problem
  • I lost heat into the cabin on this car. I took the car to team Ford on Drexel Rd in Las Vegas NV. They performed an electrical diagnosis for 119.00. The service rep said that the actuator motor failed. He">e said he sees 1 to 2 of these problems about every 2 weeks. He said replacing the electric motor is expensive, 920.00 including in that amount the diagnostic charge above. I went on line and found a salvage parts site. I got a call from Quality Auto Parts that located an actuator motor for 421.00 no labor no guarantee. The motor is inside the dash assembly mounted on the AC duct on top. Derrick said they get lots of calls on this but they are scarce. Derrick said these actuators fail a lot and are used on Fords and Lincolns. He said these motors aren't stocked at dealers and are made on demand. That's why there so expensive.

    My questions:

    Does price sound too high, Am I being taken?
    (I'm definitely going to shop around)

    Is this a labor intensive repair? I see someone here got one replaced for 600.00.
  • $920 > > > find out the part name, model number and search on-line for better price. I would not buy used. unless the part has some sort of warranty. Heck you could be buying a failed actuator since it appears to be a common issue.
    Once you have the proper model number etc, it will be easy to locate a dealership that sells GM parts 10% over cost. I've purchased several GM parts out of a dealership on-line in Texas. If I can find info on them, I'll send it your way.
    Good luck :lemon:
  • frustrayedfrustrayed Posts: 4
    edited August 2008
    intermittently my drivers zone will change the temperature to full heat even if ac is on. So far i can get it to reset if i pull over and turn it off then restart. would like to know what the problem is and how i can fix it. am out of work so moneys tight. any help would be appreciated
  • refer to my post # 180 step by step instructions-
    same issues with my 2004, caused by a dead battery.
    did you have a dead battery lately?
    computer memory for air system needs to be reprogrammed.
    Other people have posted successful steps that were as simple as disconnecting the battery negative for 30 minutes.....
    good luck
  • HEllo, I have a simliar problem but recently i noticed my heat meter doesnt go up to 210 it goes above 160 but not past the next main mark( 185?) . a minimal amount of heat is coming out but not hot like it used to be. I also notice that in the summer the rear heat/ac would only blow hot air but now in the winter it blows cool air. I need to get the heat working because it is starting to freeze here in NY. Please help me figure out how to get my truck heat working again.
  • Make sure HEAT /AC OFF postions, start vehicle.
    Turn vehicle OFF.
    Disconnect ( - ) negative battery cable.
    Remove HVAC / AC fuses ( you might have fuses under dash and hood ? )
    Let vehicle sit 30 minutes.
    Connect ( - ) negative battery cable, start vehicle for few minutes.
    Turn OFF.
    Install HVAC / AC fuses.
    Start vehicle.
    your sounds like main computer systems needs to be re-set...
    these steps will do that.
    but of course always consult your dealer, they might advise alternative steps.
    Good luck.
    Merry Christmas..
  • Hey MrBrown366 took mine to a trusted mechanic. He took temp readings on thermostat and heater hoses coming out of firewall ( all were less than 100 degrees). Changed tstat and had heater core flushed, works like a charm. $160.00. Hopefully this heps
  • Has anyone changed an aspirator in a 2002 Yukon XL? If so how was it done? Where would
    I look for the part?
  • gmpartsdirect. com
  • Hi just wanted to post that I have a 2009 Yukon with this problem. I live in South Florida and setting the temp to 78 degrees in any configuration 80% of the time causes warm/hot air to blow out the driver side vents.

    I can get cold air to blow out of the driver side if I switch to dual mode and adjust the drivers side temp below 65 degrees. Which results in too cold air.

    Paid 45K for my truck and not happy that I cannot just set the temp and hit auto like I can on my 2002 Buick Regal.

    Have been to the dealer three times, they say they cannot recreate it and say drivers side regulating the temperature is normal. I am going to try the remedy you posted and I'll post my results. Sounds like a painful process though.

    Please anyone with this problem of hot air blowing on the drivers side while cold air comes out passenger side please post in this forum.
  • 213jg213jg Posts: 2
    Low coolant will cause this problem. Make sure you have enough!
  • Anybody tell me how to install or a site to go to. I have no blowing heat. I have rear blower working however not front. I just vehicle off and get a screeching sound-i deducted it was the front blower motor so I just stopped and picked up one. Now how to install? Do I take dash off or can I access it from under?
  • Ok, looks like I got and aftermarket blower. I tried to install and hooked it up, it is a fairly easy thing to do. It didn't work! I turned the fan to high and nothing! Is there some other thing that I could look for? Its only like -2 today!
  • Dude,

    Start by telling us what make, model and year your car is. Then we might have a clue what your dealing with.

  • golfer29golfer29 Posts: 3
    the front ac works fine but the rear does not. the rear unit fan, dampers, and hot water coil works like they are supposed to. when i turn the control knob to cold i get no cold air. the air is blowing out of the ceiling vents but not cold. when i turn the control knob to hot the air comes out of the floor outlet and is warm/hot. if the front air is on and the cabin is cool the fan slows down as it is supposed to. can u help
  • golfer29golfer29 Posts: 3
    sorry, 2003 chevy tahoe with automatic climate control front and rear.
  • yukaladeyukalade Posts: 1
    I have been addressing similar problem with the "blend and placement of the airflow in my truck. I have the xl with rear air and I don't know if you have the Aux unit in th erear but the front is similar. The blowers create the air flow over the heating core or over the evap coils for heat or a/c. A door regulates the amount and is controlled by an "actuator" and they fail. One is for temp termed "mode" and another is for placement termed "blend". Most likely if you have an issue with one of these. The other possibility if temperature regulation is an issue is the sensor in the duct itself which can be detected by a scan tool. Not a difficult fix when it is determined which it is. You problem sounds more like a temp regulation issue. Good luck.... Try Just Answer and request "BlueGorilla" for illustrations and specific fixes. If you prefer to go th edealer route at least they won't j--k you around n ow that you have a sense of the issue.
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