Fluid Cooler & Fluid Warmer System

STRUCTURE AND OPERATION

FLUID COOLER & FLUID WARMER SYSTEM : System Description

The A/T fluid temperature is controlled to an appropriate level by the A/T fluid cooler and A/T fluid warmer.

A/T FLUID COOLER SCHEMATIC







COMPONENT DESCRIPTION

A/T fluid warmer





- The A/T fluid warmer (1) is installed on the front part of cylinder block of engine.
- When engine is started while engine and A/T are cold, engine coolant temperature rises more quickly than A/T fluid temperature. A/T
fluid warmer is provided with two circuits for ATF and engine coolant respectively so that warmed engine coolant warms ATF
quickly. This helps shorten A/T warming up time, improving fuel economy.
- A cooling effect is obtained when A/T fluid temperature is high.
A/T fluid cooler (with bypass valve)





- A/T fluid cooler (1) is installed in the front of radiator (2) and condenser (3).
- A/T fluid cooler is provided with a bypass valve that controls ATF
flow. Bypass valve operates by thermo wax and a return spring.
Bypass valve fully opens when A/T fluid temperature is approximately 90�
C (194�F) and fully closes when A/T fluid temperature is approximately 100�
C (212�F).





- When A/T fluid temperature is low, the bypass valve is open. Most of ATF therefore returns to the transmission without flowing into the cooler core that has larger flow resistance.





- When A/T fluid temperature rises [to approximately 100�C
(212�F)], bypass valve closes and allows ATF to flow into cooler core. ATF flowing into cooler core is cooled by air stream caused by vehicle travel and returned to transmission.