2004 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2004 Mercury Grand Marquis
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2004 Mercury Grand Marquis ProblemsTransmission Failure Common Due to Front Pump Failure
Transmission problems are common in this model, often as a result of a failed front pump. The pump loses its ability to create hydraulic pressure, which an automatic transmission needs to function. A sign of front pump failure can be a whine type noise.
The composite (plastic) intake manifold may crack near the thermostat housing and cause a coolant leak. Ford released an updated manifold that was reinforced to prevent a recurrence. No recall was issued for this problem but Ford did extend the warranty to seven years on some models from the date of purchase.
The engine may overheat at idle when the AC is on. A new, upgraded fan motor and resistor may be required to correct this concern.
2004 Mercury Grand Marquis QuestionsHeadlights won't come on. Replaced LCM under warranty. Parking lights and all other lights work. All fuses are good. My mechanic said my headlight switch and Multifunction switch (turn signal lever) are working. He believes there may be a burnt wire? (1 answer)
My headlights were working on and off and I read that there was a recall on the LCM. I was holding in the turn signal lever and the lights would stay on, however the day before I brought the car in to change the LCM the lights did not work at all. I had the LCM changed and the lights still don...
cel light on code p0108
2004 Mercury Grand Marquis RecallsHeadlights Fail To Operate
The lighting control module may fail, resulting in the loss of headlight operation. Dealers will replace the lighting control module free of charge to resolve the concern.