Volkswagen automatic transmission cooling diagram
Main cooling circuit
* Automatic transmission radiator: Cools the automatic transmission oil and passes it through the honeycomb sections.
* Cooling lines: Connect the automatic transmission radiator to the transmission.
* Automatic transmission pump: Forces oil through the cooling circuit.
*Transmission Thermostat: Regulates oil flow through the radiator to maintain optimal temperature.
Auxiliary cooling circuit
* Automatic transmission heat exchanger: Transfers heat from automatic transmission oil to engine coolant.
*Water Pump: Circulates coolant through the heat exchanger.
* Engine Thermostat: Regulates the flow of coolant through the automatic transmission heat exchanger to maintain optimal engine temperature.
Operating principle
1. The automatic transmission pump pumps hot oil into the automatic transmission radiator.
2. In the radiator, hot oil is cooled by air flow passing through the honeycomb sections.
3. If the oil temperature exceeds the set value, the transmission thermostat opens and directs the oil flow through the automatic transmission radiator.
4. If the oil temperature drops below the set value, the transmission thermostat closes and limits the flow of oil through the automatic transmission radiator.
5. In the auxiliary cooling circuit, the automatic transmission heat exchanger transfers heat from the automatic transmission oil to the engine coolant.
6. Coolant circulates through the automatic transmission heat exchanger, cooling it, and then returns to the engine.
7. The engine thermostat regulates the flow of coolant through the automatic transmission heat exchanger to maintain optimal engine temperature.