There is a vacuum pump under the dash. There some times stick. It is near the blower housing, turn the system on and lightly rap on it. Mine did that I've time and has worked ever since.
One tech described it as looking like a pistol, I can't think of a better one.
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John and Debi
2008 Beaver Contessa, 2005 Jeep Grand Cherokee,
28 years retired Fire Captain Tales of the Muttley Crew
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