2003 Mercury Grand Marquis Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 2003 Mercury Grand Marquis
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2003 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 throttle position sensor (TPS) may fail. Common symptoms of a defective TPS can be rough idle, hard starting, hesitation on acceleration, poor fuel economy, and stalling.
2003 Mercury Grand Marquis QuestionsI have a 2003 lbs ultimate. When I turn the AC on sitting idle will cause the temp to rise. The overflow tank released all the coolant from the reserve. Any suggestions for repair. Thanks (1 answer)
I put my car in drive it goes in reverse
2003 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.