Question about 2001 Mercury Grand Marquis

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My a/c fan has been shutting down whether the car is going down the road or sitting still. I am having problems because of its being tempermental. I have replaced the relay and the fuse in the fuse box behind the battery. I have unplugged the battery cables as well. What else do I need to do? Thank you.

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If you follow the wire from the blower fan under the hood, it will go to a plugin at the Firewall. This plugin is a Blower speed resistance control. There is a bolt on either side that is about 10MM in size. If nothing is in the way you would undo the 2 bolts and slide out the control after unplugging the electric connection.

The unit is mostly concealed and becomes about the size of a package of cigarettes when removed. On my 2002, the heater hose was in the way. When the engine was off and cold I removed the heater hose from the back of the engine and kept it elevated. I did not lose any great amount of Antifreeze. Then I could finish sliding out the part from the Firewall.

The part can be expensive. I took mine out of a Salvage yard for $25. Most yards charge $40 on up. This particular part can be tested by connecting it to the harness without pulling the old part.
Your car should work perfectly and then you can work on the car the next Morning when the motor is cold.

There is also a self-diagnostic in the brain of the Climate control. There is a sequence of button pushing and Codes to find to discover its content. Since you have an Intermittent short, it may not register unless you catch it at the right time. An A/C place would know about it, but the labor would cost more than trying a Salvaged part yourself. This part is a fairly common problem. A new part costing over $100 will work the same as a cheaper Salvaged one. I have done these before, I hope I explained it well enough.

Posted on Aug 01, 2010

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