6 Cooling system Servicing and maintenance works © 2009 49 Danger of scalding from hot coolant! Cooling system under pressure! Only open the cap when cool! z Open the cooling system cap (1) carefully. z Loosen the cooler venting screw if necessary. z Fill coolant up to the max. mark or filling limit. z Switch on any available heating and set to the highest level so that the heating circuit is filled and vented. z Close cooler locking cap. z Run engine up to operating temperature (open- ing temperature of the thermostat). z Switch off the engine. z Check coolant level in cooled engine and top up to the MAX mark or filling level on the compensa- tion tank if necessary.
Fill and ventilate cooling system