The vehicle is equipped with an engine cooling system consisting of a two speed fan operated by the engine management control unit according to the signals supplied by the engine coolant temperature sensor.The fan is activated at the low speed as soon as the temperature of the engine coolant exceeds around 94 °C , whilst the second (higher) speed corresponds to the level of 102 °C being exceeded.The opposite shift from second to first speed takes place when the temperature goes below 99 °C (3 degrees lower to allow a hysteresis cycle). Whilst the fan is deactivated when the temperature of the fluid goes below 94 °C.If the engine is switched off and the temperature of the coolant is above a certain level, the fan continues working at the low speed for a preset time after which it switches off automatically.If the vehicle has a diesel engine there is a certain delay between the intervention level being exceeded and the activation (or deactivation) of the fan. This is because the engine management control unit automatically acts on the engine to produce a greater torque before making the ventilation device cut in or to decrease it before changing the fan rotation to a slower speed or turning it off.