Improved coolant hoses that are able to withstand cooling system pressure are available (Jaguar Service Bulletin S518). These improved hoses help avoid engine overheating by preventing the coolant hose from inadvertently detaching from the engine.
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Newest reported 2006 Jaguar S-Type problems
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.