ANSWERS: 1
  • You have a malfunctioning "blend door" on the passenger side of the system. The repair procedure I found online indicates that you have to remove the dashboard and the A/C unit (under the dash) to repair the door or the door actuator. However, it might be possible to access it with the unit in the car. This is not something for the normal do-it-yourselfer. Take the car to a competent mechanic or Buick dealer and have it diagnosed. Good luck.

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