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it works by vacuum .if it is not working more often than not a vacuum hose is rotted. this one is hard to get at . it runs from the top of the engine to a round black ball down by the passenger front tire .start by finding the ball [a little bigger than a soft ball ]and trace the small hose back to the tee connector under the dog house [engine cover] i have used small gas hose and silicone and it works great.hope it helps and good luck.

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โˆ™ 2009-08-17 18:10:04
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Q: How does the selector switch work for switching from floor to ac to defrost in a 2000 astro?
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