Question about 1993 Mercury Grand Marquis

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2000 grand marquis blower fan stops on lower speeds

I changed out the blower motor and fan switch. the fan still only works in high speed.

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There is a resistor for the fan motor which works the lower speeds, you need to replace that, it is normally located near the blower motor, got 3-6 wires plugged in it

Posted on Jun 28, 2009

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SOURCE: blower fan stops on lower speeds 2000 grand marquis

There is a blower realy. Which steps the voltage up or down. If it fails it will run 12 volts or HIGH speed only... Replace that and your good.

Posted on Jun 28, 2009

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1 Answer

How do I replace blower motor resistor?


U are on the right track. But check this out - is the low speed on the blower the only thing that is not working? Could be other things, such as lights that you are not aware of.

On some cars the low speeds for the blower work thru the ignition switch. If something is wrong with the switch the fan will work on high speed only but the lower speeds are inoperative.

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Note: It is also common for a bad blower motor to CAUSE the controller to go bad. You MAY have to replace BOTH.

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