Question about 2000 Mercury Grand Marquis

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My blower is not working

I have checked every thing i know of the blower works and it has power going to it and the only thing that is not working is the ground wire i can bypass it by running to the battery but i dont have any control of the speed of the blower from the control switch so maybe some one can tell my why i have no ground
thank for your time

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  • fixya676 Sep 18, 2008

    Same thing with great help from

  • Anonymous Oct 20, 2008

    i had the same problem and it was the blower moter relay switch located on the firewall it is a little black box sometimes you can tap it with a scewdriver to get it to work

  • Anonymous Dec 23, 2008

    On my 2002 Grand Marquis the blower motor has power but the fan wont work.



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Description and Operation Notes The heater blower motor switch resistor has the following features:

  • The assembly is located in the engine compartment on the evaporator housing toward the center of the vehicle.
  • Three resistor elements are mounted on the resistor board to provide four blower motor speeds.
  • Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
  • An overheating protective device (thermal limiter) will open the resistor coil when the temperature reaches 121°C (250°F) interrupting the blower motor operation in all speeds except HI.
  • The thermal limiter cannot be reset and is not serviceable
my blower is not working - 83205358Here is the description of how it works and the location of the blower motor resistor that is most commonly the Problem If you don't receive the pictures or text email me at and Ill email them to you if this information is helpful please give me a fixya Rating and of course contact me if there is anything I can do to help.

Posted on Aug 26, 2008

  • Randy Harkins
    Randy Harkins Aug 30, 2008

    Hi just following up to see how its going and offfer any help I can please contat me nere or at

  • Allen R Jones
    Allen R Jones Dec 01, 2013

    The blower motor will not work on a 2004 Mercury Marquis with an automatic heater control. Both the 15 amp heater control fuse and the 40 amp blower motor fuse are good. While adjusting the control the relay can be heard clicking. The plug at the blower motor with the heater control set on high test 12.35V on the hot side of the plug and .o1V on the ground side. Bypassing the wiring harness and connecting direct from the battery + and - to the respective terminals causes the blower motor to run. Why does it not run under normal conditions.



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