2004 Mercury Marque. Air conditioning only comes on ful blast. The dial does not work. Is this something I can fix myself?? I f so, PLEASE tell me the part and where I can find it.

20

Asked by Aug 31, 2016 at 12:03 PM about the 2004 Mercury Grand Marquis

Question type: Maintenance & Repair

10 Answers

8,335

does the dial not work or is the resistor bad

54,615

It is possible the blower motor control unit has gone bad. The blower motor control is under the hood sort of behind the passenger side cam cover on the firewall. Sometimes you can tap on the module and make the blower speeds work for a few minutes or longer. If tapping on the module changes the speed then the module needs to be replaced. Photo from www.tascaparts.com

Best Answer Mark helpful
8,335

does it have automatic climate control

1 of 1 people found this helpful.
54,615

Bad solder joints are the normal failure point with these modules. Certainly there could be a problem with the blower switch or the EATC unit if equipped with ATC.

1 of 1 people found this helpful.
20

crumbob - yes, it does have automatic control

1 of 1 people found this helpful.
20

Bob, Is this something I will be able to change myself?

1 of 1 people found this helpful.
54,615

Yes if the part is bad you can change it yourself. It is not really easy, but doable by the average person with some mechanical knowledge and the tools necessary. Always disconnect the negative battery terminal when working on the electric system.

54,615

Here is a video on how to remove the blower motor control.....https://www.youtube.com/watch?v=JFq2mvfSBdk

1 of 1 people found this helpful.
54,615

For an overview on how to run a self test on the EATC module (temperature display and fan unit) go to this link....http://www.crownvic.net/ubbthreads/ubbthreads.php? ubb=showflat&Number=2357073

20

Bob, you are amazing!!!! THANK YOU so VERY MUCH!!!!!! This is actually for my mother. She keeps getting ripped off from these auto shops and it never gets fixed.

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