Question about 1997 Mercury Grand Marquis

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1997 grand Marquis Blower fan switch resister only runs on high speed...have the new resister....where is location ?

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  • Anonymous Mar 27, 2014

    blower motor only runs on high speed

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Posted on May 02, 2010

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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

1 Answer

2003 grand marquis gs blower switch is a 4 speed. the first two LOW, and next position are not working. Is the switch module or the fan motor in the engine compartment?


There are resisters that controle the fan speed located in the plenum (its the air movement that cools them). They can be checked and changed out simply by opening the hood and locating the AC evaporatot housing on the firewall (passengers side).

Oct 03, 2011 | 2003 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

Fan quit on my 2002 Mercury Grand Marquis; even though I still feel heat. Could it be a fuse? If so, how do I change it, what size do I buy?


does high speed work?

I fyes, it is bad resister coils, mounted in plenum case to keep cool.

Usually a bad blower motor will cause the fuses or resister to fail. drawing too much current as it wears out.

Also could be control head for heater system. Electronic digital controls?

Mar 31, 2010 | 2002 Mercury Grand Marquis

2 Answers

Heater blower motor blows normal then slows down 1999 grand marquis


There is a blower resister within the blower fan that is replacable. Most likely this is the problem

Jan 04, 2010 | 1999 Mercury Grand Marquis

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

2 Answers

Blower fan stops on lower speeds 2000 grand marquis


There is a blower realy. Which steps the voltage up or down. If it fails it will run 12 volts or HIGH speed only... Replace that and your good.

Jun 28, 2009 | 1993 Mercury Grand Marquis

1 Answer

Heat and Air blower does not work


hey there cjwalker,,did you try the blower ressistor its located beside the heatermotor ,,it controlls the speed of the motor ..should be easy to remove ,,,either 2 screws or else it just clips in,,,,,

Apr 19, 2009 | 1999 Mercury Grand Marquis

1 Answer

My fan control for A/C and heat


check blower motor resister in plenum housing if this is manual system.
If electronic, check blower motor speed controller.

Blower Motor Speed Controller

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Mar 20, 2009 | 2001 Mercury Grand Marquis

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