Question about 2004 Mercury Grand Marquis

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2004 Grand Marquis picked the wrong day for the air conditioner to quit working...it's 94 degrees. The fuse is fine. Oddly....it seemed to have gone out at the exact second that I checked the outside temperature. This happened once before a few months ago but a couple of days later the air conditioner started working again. What could be the problem?

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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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Check the AC charge. If it's low, add refrigerant. If the fan is not working, you'll need to check the fan and replace if it went bad. typically, a fan starts to squeal before the bearings give out and the fan quits working.

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The air conditioning is a system

It like all systems, has to be properly
diagnosed to find a problem,that was
not done or your wouldn't be here or have
an issue, still

We can not guess for you

You pay a professional & now
want to have folks speculate,not
actually work on solving the a/c issue,
so you can use it!!

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