Question about 1984 Mercury Grand Marquis

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Heater won't go off - 1984 Mercury Grand Marquis

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Hi,

If you're referring to the heater "FAN" running continuously, then its likely to be your blower motor resistor.

The heater blower motor (under the dash) has constant power supplied from the battery, but is controlled by the blower "resistor" - usually mounted on the blower motor assembly. If one or more of the blower resistor coil wires are faulty, the motor will either not work on one of the fan settings, or will constantly run by itself.

Posted on Jun 08, 2011

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Posted on Jan 02, 2017

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