Question about 2004 Mercury Grand Marquis
A blower control switch for the digital A/C. Mine went out almost the same way, driving along, checked outside temp. and then it started getting warm. No blower, no defroster, not even a trickle of air from the vents.
This part is behind the motor on the ductwork. It is inconveniently behind the heater hose on the engine. It takes 2 screws, about 9mm, and has 1 electric plug.
It is about the size of a pack of cigarettes with 90% in the vent. If you can plug in the new part to the harness you can instantly tell if it is the problem, because the A/C will work. Then remove heater hose and lose some coolant, switch part.
Oddly enough there is a diagnostic in the dash display, but it did not idenify this part.
Posted on Jul 17, 2009
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Posted on Jan 02, 2017
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