The plastic coolant reservoir is prone to leak. The reservoir can mysteriously lose coolant or coolant may pool under the engine compartment. If this occurs, the coolant reservoir should be inspected for cracks. If leaks are neglected, the reservoir may fail and cause the engine to overheat.
Car problem reports
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Most reported 2001 Jaguar S-Type problems
Premature automatic transmission failure is common. Diagnoses of the fault will be necessary to determine if repair or replacement is the proper repair.
The front and/or rear window regulators are prone to failure. A failed window regulator will require replacement.
oil leak from oil pan gasket. Not repaired yet.