The thermostat cover secures the engine thermostat within the cooling system housing on Jaguar's AJ-V8 engine, maintaining a sealed coolant circuit between the thermostat and the upper coolant passages. A cracked or warped cover can result in coolant leaks at the front of the engine, loss of system pressure, and overheating if left unaddressed. Using the correct OEM-specification replacement ensures proper sealing and dimensional fit with the existing housing. Key Features Direct replacement for the OEM thermostat cover, part number AJ85875-G Designed to mate precisely with the thermostat housing on the AJ-V8 engine - inspect the mating surface for warping before installation Meets original equipment specifications for the Jaguar X200 S-Type and X308 XJ8 cooling systems Replace the thermostat housing gasket or O-ring simultaneously to ensure a leak-free seal Vehicle Fitment This thermostat cover fits the Jaguar X200 S-Type and Jaguar X308 (XJ8), covering their respective AJ-V8 cooling and climate control systems. Not sure about fitment? Feel free to get in touch at [email protected]