Climate Control probelm 99 Silverado

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Sherri's 2500HD, Nov 16, 2012.

  1. Sherri's 2500HD

    Sherri's 2500HD New Member

    my Climate control works fine a/c or heat either one as long as it blows out the dash. But as soon as you turn heat to defrost or floor vents blower shuts down. will still blow just a little but not near enough. Any thoughts were to start?
  2. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    does the blower actually stop or is it still turning, but the air is not coming out of the vents?
  3. Sherri's 2500HD

    Sherri's 2500HD New Member

    if the blower is still turning it is very low, can not feel or hear. But windshield will finally defrost, sorry i can not answer 100%.
  4. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    Sherri, do you have auto controls (set the temp to 70 and the system will keep it there), or the manual controls where you must change the dial to change the temp?
  5. Sherri's 2500HD

    Sherri's 2500HD New Member

    Sorry its the manual control
  6. j cat

    j cat Epic Member 5+ Years 1000 Posts

    this is with what a/c system AUTO or MANUAL control ?

    disconnect the battery ground at the battery . turn ignition on to drain the system voltage. then reconnect and start vehicle see if the problem is corrected reset. with auto ac it may be the computer controller.

    if its manual control you got me on that one!

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