Question about 2006 Mercury Grand Marquis

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Climate control system out of control

The blower control on my 2001 Grand Marquis intermitently fails to work and blows up a storm and other times it works perfectly. WHat causes this? It is not the rheostat itself as I have taken it out and tested and cleaned it. The blower runs even without the rheostsat

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  • Chuck Martin
    Chuck Martin May 11, 2010

    It will run on high with out the resistor but no other speeds.

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  • 235 Answers

The reasistor is bad and needs replaced

Posted on Feb 20, 2009

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The Heater or Air Condition not blowing


You may need a mechanic for this. There is a 40amp fuse for the blower in the fuse box under the hood. There is also a blower relay. But you also have fuses and components for the automatic climate control which turns the blower on and off.

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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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It could be a blower motor resistor pack that has gone out.

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1 Answer

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1 Answer

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You will have to drain coolant.
Remove the nuts holding the Vapor Management valve and set it aside.
Remove coolant hoses to heater core.
Disconnect electrical connector to the blower speed controller,remove screws,pull it out of heater housing.

Feb 16, 2009 | 2001 Mercury Grand Marquis

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