Heater/AC problem with 2004 Yukon

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by Ront68, Nov 29, 2013.

  1. Ront68

    Ront68 New Member

    When starting the Yukon and the AC is turned on, you may get AC on one side and heat on another. Shut the engine off and restart and it may produce AC on both sides, heat on both sides, or heat on the opposite side. I have actually stopped on the shoulder of an interstate highway, shut the engine off and restart it. You can have the AC on, then get a blast of hot air in your face for a few minutes then back to AC. Has anyone had this problem before, and if so what did you do to fix it? Any help would be greatly appreciated. AC is not good when it is 20 degrees outside. Thanks...
  2. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    Without any testing, I'd say the dash module is bad.

    Try turning the auto off and just operate it manually.
  3. Ront68

    Ront68 New Member

    That is what I originally thought, but it doesn't seem to make any difference. It does not eliminate the possibility of 2 problems. The a/c and heater work fine in the rear. thanks..
  4. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    Completely separate from the front, they do share the compressor and the hot water, but that is about it.
  5. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    I think that it could be the fresh air door actuator. you can try disconnecting the battery for 10 minutes, reconnect it. turn the key forward, (not to start) and then turn on the hvac unit. do not touch it for a minute or two after you turn the unit on. if you listen closely you might hear the actuators recalibrating.

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