Question about 2004 Mercury Grand Marquis
It should be under the hood, behind the engine and inside the ductwork for the fan. It is connected to the fan under the hood. Just follow the wires from the fan and you will arrive at the Resistor connector. There are 2 bolts and 1 connector attached to it.
The unit is small, about the size of a pack of cigarettes and 90% is hidden inside the Ducts. Sometimes you have to undo the rear heater hose connection to the block. It is not apparant until you start pulling it out of the ductwork, but you will need the room. I did on my 2002 model and I can't say they improved the location in 2004.
The nice thing about replacing this part is you only need to hook up the wire connector to the new part to make it work. Then if the new part does not help, you can just leave the old part in place and try something else.
There is a test sequence for the Climate Control brain. You can do a Search in IE for the info. The codes are different from the engine Codes and you would need the list before you learned how to get it to diagnose.
If your blower just stopped for no reason and it does not work on any setting, odds are you are after the correct part already.
Posted on Sep 29, 2010
Testimonial: "It's on the firewall hidden by the heater hoses. Tapping on it temporarily got the fam working. Thanks."
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Posted on Jan 02, 2017
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