Transmission oil cooling, function - GF27.55-P-2000AHL

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TRANSMISSION 722.9 (except 722.930/931) in MODEL 212 up to model year 2011

Function requirements for transmission oil cooling, general

Circuit 87 ON
Circuit 61 "ON" (engine running)

Transmission oil cooling, general

To reach the operating temperature of the transmission quicker, the transmission oil is heated by the engine's cooling circuit.

Transmission oil cooling lowers the temperature of the transmission oil and thus prevents overheating damage in the transmission.

Function sequence for transmission oil cooling

The transmission oil is drawn out of the transmission oil pan by a mechanical pump in the transmission and is pumped via the feed to the transmission oil heat exchanger (which is integrated in the engine radiator). Then the transmission oil flows from the transmission oil heat exchanger to the transmission oil thermostat. At a transmission oil temperature <90 °C, the transmission oil thermostat directs the transmission oil back to the transmission via the return.

At a transmission oil temperature >90 °C, the transmission oil thermostat opens and the transmission oil flows through the transmission oil cooler, before it flows back through the return to the transmission.

Overview of system components for automatic transmission (AT)

GF27.10-P-9992AHL