Description And Operation: Description

WARNING: This page is about a different car, the 2018 Jaguar XF and 2017 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.

Two hose and pipe assemblies connect the transmission fluid cooler to the automatic transmission. Two engine coolant hose connections are incorporated into the top of the transmission fluid cooler for the supply and return of coolant from the engine cooling system.

Models without thermostatic valve: automatic transmission fluid (ATF) is supplied from the transmission ATF pump into the ATF cooler. After passing through the ATF cooler, the ATF passes out of the ATF cooler and returns to the transmission fluid pan.

Models with thermostatic valve: ATF is supplied from the transmission ATF pump, through a thermostatic valve (if open) into the ATF cooler. After passing through the ATF cooler, the ATF passes out of the ATF cooler and returns to the transmission fluid pan. The thermostatic valve is located in the transmission cooler fluid supply and return lines. The valve contains a thermostatic wax element which is closed when transmission fluid temperatures are below 69 °C (156.2 °F). At temperatures of 69 °C (156.2 °F) and above, the thermostatic valve begins to open allowing the fluid to flow around the cooler. The thermostatic valve is fully open at temperatures of 79 °C (174.2 °F)