Question about 2003 Mercury Grand Marquis
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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Posted on Jan 02, 2017
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
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
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
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