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GMC Yukon AC and Heat Questions

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  • I recently prurchased an 04 Yukon. I was having trouble getting the rear heater to blow hot air, then when trying it today, plenty of hot air is coming out but I can't turn it off. Any ideas?
  • Anyone know how to fix/troubleshoot rear only blowing cold air? Front works fine.
  • druthdruth Posts: 1
    Have the same problem with 2003 Yukon. Any replies ?
  • So, I read through this whole thread. I am having the same problem with one side of the car blowing the right temperature and the other side blowing the wrong temperature. I plan on trying to reset the control module later this week. But my question is this...

    In looking at the car's manual, I see a left side and right side Air Temperature Door. It seems to me that this is likely the problem. Unless the control module is not sending the right information, which I suppose is a possibility. But for those who have my problem, does the simple reset work or does the problem return?
  • I am having problems in the morning warming up my truck. No matter how long I leave it running with the heater blowing full blast it still will not blow hot. Once I am on the road it eventually starts to blow hot and will get cool again will sitting at red lights. ????? Whats up!!!!
  • rshtrsht Posts: 277
    I am guessing its your thermostat stuck in the open position...
  • Greetings! I wanted to know if you fixed your rear heater issue on your Tahoe! My 03 Yukon does the same thing and when I took it to my local GMC dealer they told me it needed a rear AC control module and an actuator and would cost $600 to fox. Forget that! I went to my local Barely Used Auto parts salvage yard and picked up the parts for $50 but that did not fix the issue. Wondering what you found out with yours. Your input will be greatly appreciated!
  • drintndrintn Posts: 4
    Hello,
    I am at my wits end!! Where to begin? This 2004 GMC Yukon problem is only on drivers side front. It has dual (slide) controls. Last summer the AC would suddenly stop blowing. Each time I would stop, turn off the ignition and re start the vehicle. Problem solved every time(5 or 6). I do recall a slight "ticking" sound when this was going on. Then it stopped. Then, while using the heater, only cold air comes out of the front drivers side vents. I did some research and changed the drivers side air door actuator. I took off (+) battery terminal, unplugged actuator(#604-106), replaced actuator, plugged it in, put (+) battery terminal back on, turned on key(without starting) waited 60 or so seconds, started and....... STILL BLOWS COLD AIR!!!!!!!
  • i have been getting heating issues with my cimate control. the heat only works on full heat or 90 degrees. if i drop to 89 it turns cold. does anyone have some suggestions to fix this?
  • i see all of the post for resets. i do not know how these are done. it seems to be an electronic issue but who knows.
  • pocokpocok Posts: 5
    You need to change the inside temperature sensor (aspirator) Parts# 025903301
    You can find in the headliner above the driver head where the little vent is
  • wow, i bet you are right, i unplugged it a while ago because it was making an awful buzzing noise. i thought it was for the on star? so how do i stop the buszzing.
  • pocokpocok Posts: 5
    edited February 2010
    "> only one way change it, just $45 and Your heating gona be work with no buzzing.
    After You change the aspirator disconect the battery for a few minute. Reconect the battery, turn on the ignition and wait min 40sec without touch any button on the heater control. After 40sec You can start the engine and adjust the temperature
  • drintndrintn Posts: 4
    edited February 2010
    any chance you could help me with my 2004 yukon problem....i am runnin out of ideas

    2004 GMC Yukon problem is only on drivers side front. It has dual (slide) controls. Last summer the AC would suddenly stop blowing. Each time I would stop, turn off the ignition and re start the vehicle. Problem solved every time(5 or 6). I do recall a slight "ticking" sound when this was going on. Then it stopped. Then, while using the heater, only cold air comes out of the front drivers side vents. I did some research and changed the drivers side air door actuator. I took off (+) battery terminal, unplugged actuator(#604-106), replaced actuator, plugged it in, put (+) battery terminal back on, turned on key(without starting) waited 60 or so seconds, started and....... STILL BLOWS COLD AIR!!!!!!!
  • pocokpocok Posts: 5
    you have 3 actuator, right side temperature door actuator, left side temperature door actuator, mode door actuator. Witch one you allredy replaced, where is located. driver side under the dash, right side under the dash or top of the dash under the dash cover
  • I have replaced the module and the actuator and still have no heat in the rear of the vehicle. Any ideas?
  • pocokpocok Posts: 5
    when the engine is hot check the auxiliary heater hoses temperature. If is OK inspect the air temperature door, open and close when you change the temperature
    If not move out the actuator and check the door moving fee with hand. If is OK probably the auxiliary inside temperature sensor the problem
  • drintndrintn Posts: 4
    I replaced the drivers side actuator under the dash.
  • pocokpocok Posts: 5
    this actuator control the air direction. The driver temperature door actuator located right side under the dash behind the center console. You need to check this actuator
  • drintndrintn Posts: 4
    thank you, i will look for that one and change it out.
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