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Why would the heater switch not change off the defrost position on a 1993 Dodge Caravan?
Wiki User
∙ 19y ago
There is a 1 way vacuum check valve in the eng compartment it is either disconnected or the valve is bad. comes of of the brake booster,thin vacuum line that goes into the vehical
Wiki User
∙ 19y ago
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Check behind the heat control panel to be sure that the vacuum hoses are all securely plugged into the control switch. As a safety measure on all cars, if you lose vacuum altogether, the default position for air direction is on defrost, so you can always see out of the windshield. Jake McCahn
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