6.4 Coolant System
6.4.1 Standard Coolant System
In the following picture the cooling system of the E4P engine is shown.
Fig. 6.2: Cooling system
The water pump pumps the coolant through the engine. The coolant leaves the engine at the heat
exchanger connection point and at the thermostat. If a heat exchanger is installed this circuit is always
flown through.
At the thermostat there are two circuits connected, the small circuit, which is flown through as long as
the engine is cold and the radiator circuit, which starts to be opened as soon as a coolant temperature
measured direct at the thermostat is above 80 °C (176 °F). Above 95 °C (203 °F) coolant temperature
the radiator circuit is full open and the small circuit totally closed.
An expansion tank is provided which contains a silica reservoir to provide the necessary corrosion
protection. The expansion tank has an overpressure valve installed which limits the relative pressure in
the coolant system to max. 2,3 bar. In addition a low pressure valve is installed to protect the coolant
system from negative pressure.
For approved coolant refer to chapter 2.5.7.2
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