Edmunds Answers


  • laltazan 08/10/11 7:31 am PST

    The mode door, that controls blower position is vacuum operated. When you accelerate, engine vacuum drops and spring pressure returns the mode door to the default, which is defrost. There is a vacuum accumulator that stores vacuum to prevent this. Chances are one of the lines between the vacuum source and the mode door actuator is leaking. The most common places are at the engine firewall and under the battery.


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