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Defrost button can't do its job 200 1990

posted by  R2 on  Sat Mar 2 14:28 CST 2002
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last visit: Sat Feb 5 09:48 CST 2011
[RELATED]

Behind the glove compartment is a vacuum diaphragm that is supposed to close off the dash vents when you push the defrost button. I moved up north for two years a couple of years ago and found that my diaphragm wasn't operating like it should. It was acting like yours, so because getting the frost off the windshield was imperative I used some bread ties to hold the diaphragm in the defrost position. I hadn't thought about that for a couple of years now as I've moved back to the southeast and don't need the defroster much anymore. The glovebox comes out easy and within a little while of pushing the defroster button you should see the diaphragm trying to work. (Naturally the engine has to be running to pull vacuum while you test).






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