Engine Compartment Fan: Description and Operation

Engine Compartment Fan

The DME control unit switches the 2 relays for the engine compartment fan.

Stage 1 (with low fan speed) is activated from an engine compartment temperature of greater than 77 °F (24.8 °C).

Stage 2 (with full fan speed) is activated additionally from an engine compartment temperature of greater than 158 °F (69.8 °C) or a coolant temperature of greater than 221 °F (105 °C).

When the engine is stopped:

Stage 2 is activated for 180 seconds from an engine temperature of greater than 163 °F (72.8 °C). The fan runs again for 180 seconds if the temperature is exceeded again. This continues until the temperature is no longer exceeded again or for a maximum of 40 minutes.