We had a very similar problem w/ our 1996 Park Avenue w/ about 110,000 miles. The airflow would come out the "wrong holes" for the button we pushed. After about 1 1/2 to 2 years of frustration, I logged every airflow response for every button pushed. An additional complication was that when we accelerated, the airflow would change all by itself. This lead the dealership (Stutzman Chevrolet, Winchester, VA)to check the vacuum harness underneath the inside dash and they discovered it was crimped, thereby "leaking" vacuum pressure, which changed the a/c airflow! Our problem was not an electronic circuit board or computer chip. It was the crimped vacuum harness under the dash. Billie
Friday, June 24th, 2011 AT 10:16 PM