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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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    an it burns lots of fuel just at park on idle . why



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Posted on Feb 06, 2009


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1 Answer

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.

May 17, 2012 | 2001 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

2 Answers

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

2005, Grand marquis, aircondition works on max or regular AC setting, but fan only works on the highest setting, will not work on slower fan speeds

this is a smiple repair, replace the blower motor resistor, this is what controls the lower speeds and is very common,the resistor is locate in the heater box next to the blower motor.

Jul 15, 2010 | 2005 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

1 Answer

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

Jun 28, 2009 | 1993 Mercury Grand Marquis

1 Answer

Air conditioner blower motor only works on hig

this is caused by a defective blower motor speed control resistor, it is located near the blower motor in the air duct the blower fits into.
here is a piture of the part. Price about $18

May 05, 2009 | 2003 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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