Are established on the 16-valve engine and the diesel engine. When the engine stops running, the circulation of the coolant also stops, which can lead to local overheating of the cylinder head. This is avoided by an additional electric coolant pump, which, if the temperature is too high, circulates a certain part of the coolant after the engine has been switched off. The auxiliary electric pump only works when the engine is off. When a certain temperature is reached, the auxiliary electric coolant pump is switched on. Simultaneously with the additional pump, the fan of the engine cooling system is also turned on.