Question about 2001 Mercury Grand Marquis

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2001 mercury marquis no fan for heater. climate controlsystem on

Dash appears to be working fine.

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  • ronsmopar Feb 19, 2009

    dash has electronic climate control the fan has power to it. i hard wired the fan and the fan works.

  • Chuck Martin
    Chuck Martin May 11, 2010

    is this electronic climate control(digital display) or manual(knobs)?

  • Tommy Walker May 11, 2010

    Have you checked to see if you have power to the fan?

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  • Mercury Master
  • 783 Answers

Ok you have a bad blower speed controller if you have power to the motor.
It is located under the hood in the heater housing just below the heater core coolant hoses.
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.

Posted on Feb 20, 2009

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Posted on Jan 02, 2017

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1 Answer

I have poor air circulation for my 2001 Mercury grand marquis. I only get air from one dash vent. the blower goes up and down but even on high it seems like it is medium


well, if nothing was disconnected on the ducts and the selector works fine , my guess will be that you have a nest in the fan it self, take it out and clean the nest so the fan can blow full amount of air. good luck.

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Heater and airconditioner control on mercery grand marquis


If the fan will not run on ANY speed in your Grand Marquis, the problem is most likely NOT the control switch.

Check for power and ground at the blower motor connector. If power and ground is present, replace the blower motor. Otherwise, the problem is most likely a failed blower speed control module (VERY common). The blower motor speed controller is located in the A/C evaporator housing just below the heater hoses.

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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there is a motor regulator in the rear of the heater near to the motor when it fails only full voltage goes though other speeds are controlled by the resister. looks like this
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Have you checked the fuse under the dash. You can run power directly from the battery as you did to test the blower just make sure you use a high amp rated switch and make sure you install an inline fuse rated no more than ten amps if you use say 14 guage wire. Let me know how it goes good luck.

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