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Repairpal verified 2004 Mercury Grand Marquis problems

 

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.

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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.

22 Reports
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Verified for the Mercury Grand Marquis
Transmission wear is common. Pieces of broken components are often discovered in the transmission oil pan when the transmission is serviced.
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