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defrost quit after engine change , blower motor still blows ,but not on windshield! what's wrong with defrost?

On this year vehicle the flapper should be vacuum controlled. You may want to look at the vacuum lines

going to and from the vacuum canister in the engine compartment. If it will change from floor to dash but not defrost

then you may have a failed vacuum line or diaphragm in the dash from the selector.

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