GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER
Results 1 to 5 of 5
  1. #1

    Default Heater/AC problem with 2004 Yukon

    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. #2

    Default

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

    Try turning the auto off and just operate it manually.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  3. #3

    Default

    Quote Originally Posted by RayVoy View Post
    Without any testing, I'd say the dash module is bad.

    Try turning the auto off and just operate it manually.
    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. #4

    Default

    Quote Originally Posted by Ront68 View Post
    The a/c and heater work fine in the rear. thanks..
    Completely separate from the front, they do share the compressor and the hot water, but that is about it.
    Ray

    '09 Avalanche LTZ - Black
    '05 Envoy XL (sold)

  5. #5

    Default

    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.

    1995 Silverado 4x4
    6" BDS Suspension Lift-3" Body Lift-Add A Leaf in rear -Trailmaster SSV Shocks-Duel Steering Stabilizer Kit -AirAid Cold air intake-
    4.56 Gears with Detroit Auburn Locker-Pro-Comp Traction Bars with duel shocks-Aluminum Skid Plate Kit-38.5" x 16.5" Mickey Thompson Baja Claws-Constant Dropping fuel gauge

    2005 Yukon XL Jet Power Programmer, Bilstein Shocks, Bilstein rear springs, Helwig Anti-sway bars, EGR Window Visors, EGR Hood Shield, Denali Headlights, Headlight harness upgrade, GE NightHawk Bulbs, White Night Rear lighting system, Russell Braided SS brake lines, PowerStop Brake pads, PowerStop cross drilled and Slotted Rotors, http://www.gmtruckclub.com/forum/sho...5-GMC-Yukon-XL
    2002 Silverado ext cab 2wd (Sold)
    2003 Yukon XL (Totaled)

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •