Service and Maintenance 6.3 Cooling System © 30 082 0 © 26 260 3 Unscrew cap 1. Loosen sealing plug 2. Unscrew vent plug 4. Unscrew sealing plug 3 (10 mm) up to the first notch. Add coolant up to the max. marking or fill-up limit (heater valve – if fitted – of the unit must be opened). Tighten sealing plug 2 (tightening torque 18 Nm) Tighten vent plug 4 (tightening torque 40 Nm) Tighten sealing plug 3. Close cap 1. Start engine and warm up until thermostat opens. Switch off engine. Check coolant level (see section 3.3.3) and top up as required. 6.3.4 Filling / Venting Cooling System 1012 / 1013 Fill/vent the cooling system :
see section 6.3.4 If a heater is connected to the cooling system, all heater valves must be opened during filling. Depending on the water content and the installation position of the heater, it may be required to repeat the last point several times to vent the heater system. ! Place container under drain plug 3. Unscrew cap 1. Unscrew drain plug 3 fully. Drain coolant. Drain the remaining fluid from the engine oil cooler (coolant duct). Screw in the sealing plug 3 up to the first notch and screw in the sealing plug on the oil cooler (arrow). Be careful when draining hot coolant – danger of scalds! Collect drained coolant and dispose of according to envi- ronmental regulations.
6.3.3 Draining Cooling System 2 3 1 4 1012 / 1013 ! © 2002 6