In addition to the checks already listed for weekly inspection, the author believes that it is worth taking the time to check the thermostat. This is situated on the underside of the engine, offside of the car. Remove the four set screws and the cover plate.The purpose of the thermostat is to operate flaps in the ducted air cooling system; when the engine and thermostat are cold, the flaps remain in the closed position and limit the amount of cooling air delivered to the cylinders; when the engine and thermostat reach 65-70 degrees C then the thermostat should expand in length to 46 mm (1.8 in.), at which point the flaps will have fully opened and In addition to the checks already listed for weekly inspection, the author believes that it is worth taking the time to check the thermostat. This is situated on the underside of the engine, offside of the car. Remove the four set screws and the cover plate.The purpose of the thermostat is to operate flaps in the ducted air cooling system; when the engine and thermostat are cold, the flaps remain in the closed position and limit the amount of cooling air delivered to the cylinders; when the engine and thermostat reach 65-70 degrees C then the thermostat should expand in length to 46 mm (1.8 in.), at which point the flaps will have fully opened and
