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Location of blower motor switch resistor on 2004 Grand Marquis

Where is the blower motor switch resistor located on a 2004 Mercury Grand Marquis and is that the cause of my problem...speed 3 is same as speed 2.. I have only 3 of 4 speeds.

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Posted on Feb 06, 2009

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2003 Mercury Grand Marquis temperature control sensor location


its locate under the hood at the front of the car on the driver side.

Feb 22, 2013 | 2003 Mercury Grand Marquis

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Where to locate a/c blower resister in a 2004 grand marquis


  • For this a 2004 Grand Marquis the blower motor resistor is located on the bottom of the heater/AC housing on the passenger side of the car under the instrument panel. You need to remove the glovebox off from the instrument panel to replace it.
  • To change it follow these steps.
  1. Remove the neg battery cable from the battery.
  2. Wait 5 minutes before moving on. This is important to wait or you risk the air bags accidentally deploying.
  3. Remove the glovebox from the instrument panel.
  4. Pull out the lock on the blower motor resistor wire harness connector to unlock the connector latch.
  5. Depress the latch on the connector and unplug the connector from the resistor.
  6. Now remove the two screws holding the resistor in place.
  7. Now remove the resistor.
  8. Revers steps to install new on.
  9. hope this helps.

Regards, Tony

Jun 12, 2011 | 2004 Mercury Grand Marquis

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Need to change fan motor control switch? Only works on high setting.


this problem is not caused by the switch, it is caused by a defective blower motor speed control resistor, the resistor is located near the blower motor.

Sep 22, 2010 | 2003 Mercury Grand Marquis

1 Answer

1999 grand marquis were the blower motor resistor is located


this is for manual heater system. If you have electronic (digital display) you don't have one. Instead you have a blower motor speed controller.

here is info

Control System Outputs—Manual A/C
Blower Motor Switch Resistor
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.

Dec 12, 2009 | 1999 Mercury Villager

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My 2004 grand marquis blower motor runs only on high so I assume its the resistor. Where is it located & what does it look like? Thanks! Bill


Its under the hood, just to the right and down of where the heater hoses connect on the firewall. It will have 4 wires going to it.

Nov 24, 2009 | 2004 Mercury Grand Marquis

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Ac blower motor


Check fuse supplying fan is not blown,
Check blower control switch is operating OK,
Check relay controlling fan is operating OK,
Check variable speed resistor pack is not faulty (the resistor pack is usually located in the blower ducting, in the blower airflow),
Check blower motor ground connection is not missing.

Aug 12, 2009 | 2000 Mercury Grand Marquis

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2000 grand marquis blower fan stops on lower speeds


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

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Blower for heater on a 2000 mercury marquis works some days and doesn't some days,,,why and where do you locate a resistor?


The resistor has two screws holding it onto the plastic case. The same case that houses the blower motor. The blower cools the resistor while its running.

May 12, 2009 | 2000 Mercury Grand Marquis

3 Answers

Location of blower motor switch resistor on 2004 Grand Marquis


The blower speed controller is located under the hood on the right or passenger side on the heater housing just to the side of the heater hoses near the very back of the right cylinder head.
Yes that would cause the concern you are having.

Feb 05, 2009 | 2000 Mercury Grand Marquis

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