DA 42 AFM Airplane Description
Doc. No. 7.01.05-E Rev. 8 15-Dec-2017 Page 7 - 49
7.9.6 COOLING SYSTEM
Each engine is liquid cooled. The liquid cooling system consists of a radiator and a bypass
to this radiator. The bypass is in operation when coolant temperatures are low. It therefore
allows the engine to warm-up quickly. Upon reaching a certain temperature (approximately
88 °C or 190 °F) the radiator is activated by a thermostat valve. Additionally a coolant
to air heat exchanger is provided for the cabin heat system. The flow through the heat
exchanger is independent of the coolant temperature. An expansion tank helps to adjust
the pressure in the system. The system is protected against over pressure by means of
a pressure relief valve.
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