A/C Blend door noise

Discussion in 'General Chevy & GM Tech Questions' started by scooby2b2, Oct 21, 2008.

  1. scooby2b2

    scooby2b2 New Member

    Hello, I am new to the forum and sure yall have had this question a dozen times but while going down the freeway with A/C on max, The blend doors make poping noise and air volume goes down like yuo swithched from max/recirculate air to normal outside air then a few min. later back to max. This goes on all the time and less noticable the slower you go but you still get the pop noise. any hints from anyone?
  2. 04sierracrewcab

    04sierracrewcab Epic Member 5+ Years 1000 Posts

    my work truck has this problem ac blows less with speed/ acceleration i believe its a vacume leak of some sort
  3. scooby2b2

    scooby2b2 New Member

    A/C blend door

    I thought these were elctronically controled, not by vacume like the older80's style ones were. I could be wrong though, I will look further into it this weekend and let yall know.:glasses:
  4. 04sierracrewcab

    04sierracrewcab Epic Member 5+ Years 1000 Posts

    the work truck is an 84 ...
    but the newer ones are electronically controled :neutral:

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