Automatic transmission cooling system for Volkswagen
Volkswagen automatic transmissions are equipped with a cooling system to maintain the optimal operating temperature of the transmission. The cooling system usually consists of the following components:
1. Radiator
*The radiator is a heat exchanger that transfers heat from the transmission fluid to the engine coolant.
* The coolant then circulates through the engine, where it cools and removes heat from the engine and transmission.
2. Piping and hoses
*Pipes and hoses connect the radiator to the transmission, allowing fluid to circulate.
*Pipes are usually made of metal and hoses are made of rubber or synthetic materials.
3. Automatic Transmission Fluid (ATF)
* ATF is a special fluid designed for use in automatic transmissions.
* It lubricates moving parts, transfers power from the engine to the wheels and helps dissipate heat.
4. Thermostat
* The thermostat regulates the flow of ATF through the radiator.
*When the ATF reaches a certain temperature, the thermostat opens, allowing fluid to circulate through the radiator to cool.
5. Temperature sensor
* The temperature sensor monitors the ATF temperature.
* It transmits a signal to the Transmission Control Module (TCM), which then regulates the transmission to maintain optimal temperature.
Working principle:
1. ATF heats up when the transmission is running.
2. Heated ATF circulates through the lines to the radiator.
3. The thermostat opens allowing ATF to flow through the radiator.
4. The radiator transfers heat from the ATF to the engine coolant.
5. Cooled ATF returns to the gearbox.
Maintenance:
* Check the ATF level and the condition of lines and hoses regularly.
* Drain and replace ATF according to the manufacturer’s recommended maintenance schedule.
* Repair any ATF leaks immediately to prevent transmission overheating.