Problems for specific Mercury Grand Marquis years:

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Most reported 2003 Mercury Grand Marquis problems

 

Reported by bearmug and 156 others for the Mercury Grand Marquis

The car had 64600 miles on it and the headlights started going out while driving, which can be very dangerous. The problem is in the Light Control Module which is an expensive part (around $500 to $600 + labor).

157 Reports
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Verified for the Mercury Grand Marquis

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.

107 Reports
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Verified for the Mercury Grand Marquis

A spring in the seat belt buckle may wear or fail, causing the airbag light on the instrument panel to illuminate. Failed buckles will require replacement.

53 Reports
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Verified for the Mercury Grand Marquis

The heater hose outlet may leak coolant at the back of the intake manifold. Sometimes this is misdiagnosed as a leaking intake manifold gasket because it resembles a leaking manifold.

24 Reports
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Verified for the Mercury Grand Marquis
Wear on the rear axle shafts near the bearings can create excessive play and lead to gear oil leaking past the seals. Gear oil will leak onto the brake backing plate, brakes, and wheels.
14 Reports
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Reported by gusstopfl for the Mercury Grand Marquis

Solution: Ford Motor company has a recall on this part. Had mine repaired yesterday, May 8, 2015.
Matthews Currie Ford, Venice, Fl. No charge to me. Check with your dealership for the recall information...
Good Luck..

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