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A vacuum leak, or one of the doors is sticking/bad vacuum motor in the heater box.

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βˆ™ 2005-01-15 06:18:41
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Q: What could the problem be on 1988 Ford Aerostar when AC blows air out dash vents and floor but heater and defrost do not blow any air at all?
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Why would your heat only work on defrost?

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