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Lotus Service Notes Section PL Page 11 PL.3 - COOLING FANS & RE-CIRCULATION PUMP The two cooling fans are fitted beneath the radiator or (with a.c.) condenser/radiator package, and the coolant re-circulation pump is mounted below the header tank. Both the fans and pump are controlled by the The cooling fans are switched as a pair, and will operate at half speed (connected in series) when coolant temperature reaches 98°C on rise, and switch off at 94°C on fall. If coolant temperature rises to 103°C, the The fans will also run at half speed, unless high coolant temperature dictates otherwise, when the a.c. is switched on and the compressor is running, or if the engine management system detects a fault with the inlet At road speeds in excess of 85 mph (135 km/h), equating to the fan stall speed, all fan functions are switched off. Heat Soak In order to help control engine temperature after switching off an engine whose temperature is over 88°C, the ECU will remain powered for a period of 20 minutes to allow heat soak management. A coolant re-circulation electric pump is mounted below the coolant header tank and is plumbed into the heater supply line. When energised, the pump circulates coolant through the engine and heater system, Fan Control Module The cooling fans, re-circ. pump and a.c. compressor are controlled by a relay module mounted to the top of the passenger side wheelarch liner. Important Note: The a.c. relay module is identical in appearance to the If the ECU receives a coolant temperature sensor signal voltage outside of the acceptable range, a default setting equating to 60°C will be substituted, and the cooling fans activated at half speed as an engine Note that a blockage in the a.c. system may result in the cooling fans running at full speed. |