Description and principle of operation (Freelander 2)

Tightening torques

Description	Nm	lb-ft
Transmission Fluid Cooler Bolts	10	7

Normal climate

Pos.	Spare part number	Name
1	-	Transmission fluid cooler

Hot climate

Pos.	Spare part number	Name
1	-	Air-to-air transmission fluid cooler
2	-	Transmission fluid cooler cooled by engine coolant

The AWF21 transmission is equipped with an external liquid cooler, which reduces the temperature of the transmission fluid.

In markets with normal climates, a plate cooler is used, and engine coolant is used to reduce the working fluid temperature.

In hot climate markets, in addition to the plate cooler for normal climates, an air-blown cooler is used. It provides additional cooling at the higher air temperatures that are typical in these markets.

Cooler - normal climate

Pos.	Spare part number	Name
1	-	Engine coolant inlet
2	-	Transmission Fluid Line - To Gearbox
3	-	Transmission Fluid Line - From Gearbox
4	-	Engine coolant release
5	-	Transmission fluid cooler

The transmission fluid cooler is mounted on the left edge of the radiator. The fluid cooler consists of an aluminum housing that contains louvered fins and plates. The plates provide a cross-flow of transmission fluid and engine coolant through the cooler. The plates are immersed in the engine coolant on the "cold" side of the radiator, which provides cooling of the transmission fluid due to the temperature difference between the transmission fluid and engine coolant.

In the engine cooling system, the low temperature zone is located in the upper third of the radiator. The flow of engine coolant through this section of the radiator is restricted by the transmission fluid cooler. Therefore, the engine coolant in this section of the radiator flows through the cooling pipes at a slower speed. Here, the engine coolant is cooled more than in the lower section of the radiator and, therefore, provides increased cooling of the transmission fluid.



The transmission fluid pump delivers transmission fluid to the lower port of the cooler. After passing through the cooler, the transmission fluid exits through the upper port and returns to the transmission oil pan.

Cooler - hot climate

Pos.	Spare part number	Name
1	-	Engine coolant inlet
2	-	Engine Coolant Outlet (Hidden)
3	-	Transmission fluid cooler cooled by coolant
4	-	Transmission Fluid Line - To Gearbox
5	-	Transmission Fluid Line - From Gearbox
6	-	Air-to-air transmission fluid cooler

For hot climates, the transmission fluid cooling system uses the same cooler as the standard cooling system, but with an additional air-to-air cooler located in front of the radiator and air conditioning condenser.

This liquid cooler operates in the same manner as the normal climate cooler described. The air-to-air cooler has two end tanks connected by hollow plates. The plates allow transmission fluid to flow from one end tank to the other, and air flows over the plates, cooling the transmission fluid.

At the pump outlet, the transmission fluid is divided between a conventional cooler and a to-air cooler. Some of the transmission fluid flows from the pump into the to-air cooler. The fluid passes through the cooler fins and is cooled by the air flowing over the fins. The transmission fluid is then routed to a tee with the fluid line of the conventional cooler, after which it is returned to the transmission.