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1993 lumina heat comes out under dash when heater off and ac won't come through vents?
Wiki User
∙ 14y ago
Probably a vaccum leak. The vents default to the defrost vents (Windshield) when there is no vaccum. The main vaccum connection is on the throttle body. The thin lines become brittle and break very easily. Good luck finding the leak.
Wiki User
∙ 14y ago
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