Bypass Mode; Mixed Mode; Cooler Mode - Mercedes-Benz OM 471 Introduction Into Service Manual

System components

Bypass mode

1 Oil/coolant module
2 Coolant thermostat
3 Coolant pump
KA Coolant outlet (to engine)
KE1 Coolant inlet (from bypass line)
KE2 Coolant inlet (from cooler)
The coolant thermostat (2) is closed for a coolant inlet
temperature < 87∞C. The coolant only circulates in the engine.
The vehicle heating heat exchanger can, however, be flowed
through.

Mixed mode

1 Oil/coolant module
2 Coolant thermostat
3 Coolant pump
KA Coolant outlet (to engine)
KE1 Coolant inlet (from bypass line)
KE2 Coolant inlet (from cooler)
For a coolant inlet temperature > 87∞C and < 95∞C the coolant
thermostat (2) opens partially and the coolant flows at the same
time through the engine radiator and the short circuit line to the
coolant thermostat (2).

Cooler mode

1 Oil/coolant module
2 Coolant thermostat
3 Coolant pump
KA Coolant outlet (to engine)
KE1 Coolant inlet (from bypass line)
KE2 Coolant inlet (from cooler)
The coolant thermostat (2) is completely open for a coolant inlet
temperature > 95∞C. The coolant is fully fed to the engine
radiator.
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