Question about 2003 Mercury Grand Marquis

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2003 grand marquis climate control fan speed runs only on high

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  • Master
  • 417 Answers

Its probably going to be the fan resistor. Most times it is on top of the fan itself but could be elsewhere behind dash. 90% sure thats your prob though.

Posted on Nov 01, 2012

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz
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SOURCE: climate control codes

I have checked every site that I can think of and run the question many times, unable to get the procedure, maybe a nice tech at the local dealer will help u out, if not I guess buying a service manual might be your only option. I am a retired Ford mechanic, I did almost all the AC work, I never found this problem was a control head issue, it was always the blend door electric motor, I think you can see it from the glove box if you remove the liner.

Posted on Sep 09, 2008

chrischronic
  • 235 Answers

SOURCE: Climate control system out of control

the reasistor is bad and needs replaced

Posted on Feb 20, 2009

  • 83 Answers

SOURCE: 2000 grand marquis cruise control not working

Have seen this problem before. You need to look under dash at brake pedal and find a blue switch with plunger contacting pedal, disconnect connector and jump with a peice of wire and drive to see if cruise works and if it does replace deactivation switch this should get you going.

Posted on Aug 26, 2009

johnjohn2
  • 5763 Answers

SOURCE: 2005, Grand marquis, aircondition works on max or

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.

Posted on Jul 15, 2010

  • 3 Answers

SOURCE: The automatic climate control system in my 96

my ac will only blow hot air.. i need a digital climate control reset code for my 1996 mercury grand marquis..

Posted on Aug 12, 2011

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1 Answer

Fan speed control works on high only


I am experiencing the same problem. I've had two different diagnoses:

1) Blower Motor Control Module/Resistor (under $40)
Dorman Part # 973442
2) AC and Heater Control Switch (Reman. Part: $234 + Core charge of $222.)
DORMAN Part # 599030
(Prices current from RockAuto.com.)

In addition to the recent blower problem, 5 years ago I had the A/C blowing out the floor/defrost vents only, too; but with no vacuum leaks. I was told then I needed the AC/Heater Control Switch; but instead I made it a "manual" automatic climate control. I disconnecting the vacuum connector plug from the control unit and used the male end to make the connections. It was much easier on my pocket book and still works today.

The connections I found on my 2003 Grand Marquis:
Black: Supply
Blue: Panel door
White: Air inlet door
Yellow: Floor/Defrost door
Red: Floor door

The Fix:
I used a vacuum hose directly from Black to Blue and White. This required a short piece of vacuum hose with one T connection. The temp control still works including the fan speed control (until now). I live in Texas and it doesn't get too cold. But occasionally I connected Black to Yellow directly to get me thru those real bad cold spells.
Bottom Line: Not sure what I going to do but leaning towards replacing the Control Switch and the vacuum connector plug. Especially, since the price of the switch is more reasonable today. A 50% savings from 5 years ago.

Jul 05, 2014 | 2003 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

Fan control knob on a/c and heater will only run on high speed. 2003 dodge mini van


I replaced the fan module under the glovebox on my 2005 Town & Country last night. Mine would not shut off at all with key on. It only blew on high no matter where I set the switch. Mine also had the climate control which makes a difference. If it is not the auto climate control it is usually the blower resistor if the other fan speed selections don't blow at all except on high.

Jun 06, 2011 | 2003 Dodge Grand Caravan AWD

1 Answer

2007 blower motor speed control for a Mercury Marquis. I only have high,is their is something besides climate control (act unit)., dash climate control is all low ampereage, and blower is high amps 30 0r...


there is a motor regulator in the rear of the heater near to the motor when it fails only full voltage goes though other speeds are controlled by the resister. looks like this
new-blower-motor-resistor-for-ford-mercury-lincoln-oe-6w7z19e624a-8w7z19e624a-9w7319e624aa-yw1z19e624aa-tptxtr3n11io0d2afxookjvk-1-0.jpg its screwed into the heater box.

Aug 09, 2017 | 2007 Mercury Grand Marquis GS Sedan

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

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

Mercury grand marquis,ls,2001. the ac blower is not working. I jumped the fan direct from the battery and it works. How can I by pass the climate control and install a manual switch. I beleive the climate...


Have you checked the fuse under the dash. You can run power directly from the battery as you did to test the blower just make sure you use a high amp rated switch and make sure you install an inline fuse rated no more than ten amps if you use say 14 guage wire. Let me know how it goes good luck.

Mar 15, 2009 | 2001 Mercury Grand Marquis

2 Answers

Climate Control Blower motor stopped working


I had the same problem with my 2000 Mercury Grand Marquis. I ended up replacing the blower and the resistor which is on the passenger center side of the firewall tucked in where it is hard to get to. Everything worked fine for about two years. It just went out again here about a month ago. I am going to try to replace the resistor again, but I am wondering if it doesnt have something to do with the climate control switch. I do not want to replace the same part every year or two, so if anyone has a idea of what could possibaly be the bigger problem, please let me know.

May 29, 2008 | 2000 Mercury Grand Marquis

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