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.
Problems for specific Ford Crown Victoria years:
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Most reported 2004 Ford Crown Victoria problems
Transmission wear is common. Pieces of broken components are often discovered in the transmission oil pan when the transmission is serviced.