Question about 2007 Buick Lucerne CXS Sedan

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Why does the heat only come out the panel vent no matter what setting it is on

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Could be a faulty blend door under the dash, or the main controller.
The blend doors would need to be tested.

Posted on Jan 17, 2013

  • 1 more comment 
  • jcolbethwant
    jcolbethwant Jan 17, 2013

    Could it be a fuse?

  •  Stephen
    Stephen Jan 17, 2013

    I doubt it. The blend doors get power from the same circuit that controls the temp settings.

  • jcolbethwant
    jcolbethwant Jan 17, 2013

    Good to know, the temp control settings and the fan all work, just when you switch the knob to defrost only still only comes out the panel vents

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