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Thread: a/c problem

  1. #1

    Default a/c problem

    The a/c blows hot air on leftside but cold on right at times.

    If I shut truck off it goes back to normal.

    2004 2500HD

  2. #2


    This is a common issue with the blend doors overtraveling, sticking, or their actuators going bad. In your case it's the driver's side. I've heard there's a reset procedure for this, but as my issue was a dead passenger side blend door actuator (i.e. turning the truck off/on wouldn't help), I'm unfamiliar with the reset procedure. (You can read more about the actuators and such here, if interested:

    If I were you I'd be sure to dig around with Google to find and try a reset procedure before spending any cash on this, as your actuator is clearly working, for now...

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