Automatic Transmission Fluid Cooler

WARNING: This page is about a different car, the 2018 Land Rover Discovery Sport. However, it is still accessible from the selected car via links, so may be relevant.

ITEM	DESCRIPTION
1	Hose connection - Engine coolant outlet
2	Hose connection - Engine coolant inlet
3	ATF cooler
4	Mounting bracket
5	Thermostatic valve

The Automatic Transmission Fluid (ATF) cooler is secured to the left side of the transmission main casing with three bolts. The ATF cooler has three lugs which locate in corresponding lugs on the transmission main casing and secured with a screw. The ATF cooler is an aluminum housing comprising louvered fins and plates. The plates allow a cross-flow of ATF and engine coolant through the ATF cooler.

The plates are immersed in engine coolant from the ATF warming valve. This provides cooling of the ATF by the temperature differential between the ATF and the engine coolant.

The ATF cooler has an integral thermostatic valve, which controls the ATF flow through the cooler. Flow is restricted to improve ATF warm-up time. The thermostatic valve is closed at temperatures of 78°C (172°F) and below, starts to open at temperatures of between 78 and 84°C (172 and 183°F) and is fully open at temperatures of 96°C (204°F) and higher.

For additional information, refer to: TRANSMISSION COOLING - INGENIUM I4 2.0L PETROL