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Picture where the heater control speed module is located on a 2002 Grand Marquis

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2002 Grand Marquis A/C blower panel.picture where the heater control speed module is l - 1_17_2013_5_13_28_pm.jpg

Posted on Jan 17, 2013

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There isn't any relay. The 2000 Mercury Grand Marquis has a blower motor speed control located adjacent to the EATC module

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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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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

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1998 Grand Marquis. Start goods. idols low. put in gear, stalls out. Changed fuel filter & had injectors serviced. Problem remains. Could it be the Transmission modulator valve?


I would check the operation of the idle speed control valve, it is what changes the idle speed when a load like the transmission is put on the engine, without it the engine will idle slow and stall out, this is even more apparent when reverse gear is selected or drive or the AC is tuned on. The ISC valve is located on the side of the throttle body top of upper intake manifold. Below is a picture of the ISC (idle speed control valve)
11_11_2011_10_58_29_pm.jpg

Sep 30, 2011 | 1998 Mercury Grand Marquis

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Location of heater control valve on a 1996 Grand Marquis


It is right there in the in the dash. It is the whole panel, where you have all your fan speed, heater , ac and vents.

Apr 16, 2011 | 1996 Mercury Grand Marquis

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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

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

1 Answer

2001 mercury marquis no fan for heater. climate controlsystem on


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.

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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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