Question about 2003 Mercury Grand Marquis

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Need tofind out what a control circuit for a 2003 Grand Marquis fan motor can be located

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If your fan went out, check the Resistor for the Blower motor. Just trace back the wires from the fan to a connection on the Firewall. This part will have 2 small bolts and 1 wire connector. Tap that part and see if it will start working.

If you get a Replacement part you can hook it up to the connector before removing the old part. It should work instantly if that is your problem. To remove the old part, you will need to deal with the heater hoses that are in the way.

I had to unhook 1 at the rear of the engine. I worked on a cold engine and I did not lose much Antifreeze by disconnecting the hose. My car was a 2002 Grand Marquis. Guess leaving the Radiator cap on keep the water from pouring out the engine.

Posted on Oct 08, 2010

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2007 ford taurus condensor fan not coming on with ac


Fan Control The PCM monitors certain parameters (such as engine coolant temperature, vehicle speed, A/C on/off status, A/C pressure) to determine engine cooling fan needs.
For variable speed electric fan(s):
The PCM controls the fan speed and operation using a duty cycle output on the fan control variable (FCV) circuit. The fan controller (located at or integral to the engine cooling fan assembly) receives the FCV command and operates the cooling fan at the speed requested (by varying the power applied to the fan motor).


EDGE/MKX, FIVE HUNDRED/FREESTYLE/MONTEGO, FUSION/MILAN/MKZ, CROWN VICTORIA/GRAND MARQUIS, TOWN CAR: FCV DUTY CYCLE OUTPUT FROM PCM (negative duty cycle) FCV Duty Cycle Command (NEGATIVE (-) duty cycle) Cooling Fan Response/Speed Greater than 0 but less than 5% Fan off, controller inactive Greater than 5% but less than 10% Fan off, controller is in active/ready state Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
10% - 90% Edge/MKX, Crown Victoria/Grand Marquis, Town Car:
Linear speed increase from 30% to 100% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
30% - 90% Five Hundred/Freestyle/Montego, Fusion/Milan/MKZ:
Linear speed increase from 50% to 100% Greater than 90% but less than 95% 100% Greater than 95% but less than 100% Fan off
For relay controlled fans:
The PCM controls the fan operation through the fan control (FC) (single speed fan applications), low fan control (LFC), medium fan control (MFC), and/or high fan control (HFC) outputs. Some applications will have the xFC circuit wired to 2 separate relays.
For 3-speed fans, although the PCM output circuits are called low, medium, and high fan control (FC), cooling fan speed is controlled by a combination of these outputs. Refer to the following table.
If you don't understand these thing's listed above your best bet is to take your vehicle to a qualified repair shop . Have the vehicle checked for DTC'S - diagnostic trouble codes !
If

Jun 14, 2016 | Ford Cars & Trucks

3 Answers

My radiator fan stays on its not the relay,could it be the sensor? where is it located if it is the sensor? thanks laurie


Could very well be the sensor (thermostat). No idea where yours is located, but parts store location chart may help, or you could buy a shop manual.

May 23, 2015 | 2003 Mercury Grand Marquis

1 Answer

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

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

1 Answer

Where is the radiator fan relay in an 2003 Mercury Grand Marquis?


there is not a relay per se, but there is a control module. trace the wires from the fan motor to the control module.
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Jun 19, 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

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

Ac or heat wont blow


Needs a blower motor resistor if the fan only blows on one speed. It is located underneath the firewall on the outside, near where the passenger exhaust system is. You need to take the passenger side cat converter off to get to it.

Jun 02, 2009 | 2003 Mercury Grand Marquis

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