2004 Mercury Grand Marquis Problem Reports

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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.

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 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.

Transmission wear is common. Pieces of broken components are often discovered in the transmission oil pan when the transmission is serviced.