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Auto Parts and Repairs
Heater Cores and Blower Fans
Lincoln Town Car
Car Heaters

Why would the blower of a 1990 Lincoln Town Car switch from the heater to the vent to defrost when accelerating or decelerating?


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Wiki User
2004-10-25 16:57:04
2004-10-25 16:57:04

the heater controls are run on engine vacuum. When a engine is accelerating it has a drop in vacuum. There is a one way check valve that keep vacuum in the heater circuit that has gone bad. You could have it fixed or you can deal with it, its not that big of a deal

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It is for vacuum storage. It keeps blower mode from switching to defrost when accelerating. The mode selection is vac controlled and will default to defrost when vac is lost or low. This stored vacuum keeps that from happening

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No, the rear defrost is just an electric grid on the rear window. No air movement involved.


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