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

7,255

does the dial not work or is the resistor bad

40,695

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
7,255

does it have automatic climate control

1 out of 1 people think this is helpful.
40,695

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 out of 1 people think this is helpful.
20

crumbob - yes, it does have automatic control

1 out of 1 people think this is helpful.
20

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

1 out of 1 people think this is helpful.
40,695

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.

40,695

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

1 out of 1 people think this is helpful.
40,695

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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