Description

Transmission Cooling

OPERATION

Standard Climate Cooler
Engine coolant is circulated through the plate cooler which cools the transmission fluid flowing through the cooler by the temperature differential between the two fluids.

Auxiliary Transmission Fluid Cooler
Transmission fluid flows through the auxiliary transmission fluid cooler plates. Ambient air from the front of the vehicle flows between the plates cooling the fluid as it passes through the cooler.

DESCRIPTION

COOLER - STANDARD CLIMATE









The transmission fluid cooler is attached to the LH (left-hand) end of the radiator. The fluid cooler is an aluminium housing comprising louvered fins and plates. The plates allow a cross-flow of transmission fluid and engine coolant through the cooler. The plates are immersed in the engine coolant from the 'cold' side of the radiator which provides cooling of the transmission fluid by the temperature differential between the transmission fluid and the engine coolant.
The engine cooling system has a low temperature zone in the top third of the radiator. The engine coolant flow through this section of the radiator is restricted by the transmission fluid cooler. Therefore the engine coolant has a slower flow rate across the cooling tubes of this section of the radiator. This cools the engine coolant more than the lower part of the radiator and consequently provides increased cooling of the transmission fluid.

COOLER - HOT CLIMATE









In hot climate markets the transmission fluid cooling system uses the same fluid cooler as the standard climate system, but with an additional auxiliary transmission fluid cooler located in front of the radiator and A/C (air conditioning) condenser.
The operation of the fluid cooler is as described for the standard climates cooler. The auxiliary transmission fluid cooler comprises two end tanks, interconnected with hollow plates. The plates allow transmission fluid to from one end tank to the other, with the air flowing over the plates cooling the transmission fluid and it passes through the cooler.
The transmission fluid output from the transmission pump is diverted via a tee connection into the auxiliary transmission fluid cooler. The fluid flows through the auxiliary transmission fluid cooler with the air flow over the plates removing heat from the fluid. The fluid is then directed back to a tee connection with the fluid pipe from the standard fluid cooler and is then returned to the transmission.