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Most reported 2002 Mercury Grand Marquis problems

 

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.

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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.
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