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 2003 Ford Crown Victoria problems
Catalytic converter failure is common. Internal components become loose, causing a rattle or creating back pressure in the exhaust.