Heater Cores and Blower Fans
Dodge Caravan
Chevy Blazer S-10
Car Heaters

Why would the heater switch not change off the defrost position on a 1993 Dodge Caravan?


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Wiki User
2005-03-04 01:07:19
2005-03-04 01:07:19

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


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it should if you have the heater control in the defrost position this is to remove the moisture from the air

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You have a vacuum line disconnected probably under the hood. The HVAC controls are operated by vacuum and when there is no vacuum it system goes into defrost mode.

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Yes, the ac will run in the defrost position to dry the windshield.

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I have looked up time to change heater core on 2000 dodge caravan it said 2 hours. I have never done this so I need to know where to start?

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