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Air on my feet 200 1989

posted by  Jim Holst on  Tue Aug 3 04:03 CST 2004
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last visit: Tue Jan 4 11:05 CST 2011
[RELATED]

When you start to climb a hill and step on the accelerator, the vacuum in the intake manufold goes down. It is this vacuum which operates the small actuator which controls the air flap in the heater/AC system. In your case there isn't enough vacuum to keep the flaps in position to direct the cold air through the dash vents.

The problem could be a leaky vacuum connection under the dash or from the engine manifold to the dash. There is a small black and white one-way vacuum valve in the vacuum line from the manifold to the dash. It is usually right up on top of the manifold and easy to see. This could be at fault. My experience has been that the rubber vacuum line gets stiff and cracks. The last time I had this problem, I just replaced this line from the manifold to the vacuum reservoir under the center console and all was well.






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