6 © 2002 6.3 Cooling System Service and Maintenance © 30 277 0 © 30 191 0 2 6.3.8 Filling/Venting the Cooling System Unit Engine Unit engine (6 cylinders) Open the cap 1 of the expansion tank. Slowly add coolant up to the max. marking or filler limit. Close the cap. Start the engine and warm up until the thermostat opens, the upper coolant line warms up tangibly. Briefly run the engine at nominal output (fixed setting), this rinses out any pockets. Switch off the engine and leave to cool down. Open cap 1, add coolant up to the max. marking or filler limit and close the cap 1. Once the engine has been run once, check the coolant level when the engine is cold.
If a heater is connected to the cooling system, the heater valves must be opened when coolant is added. De- pending on the coolant contents and the installation location of the heater, it may be necessary to repeat the procedure several times. 2 1 Open the cap 1 of the expansion tank. Place a container beneath sealing plug 2. Unscrew the sealing plug 2. Drain off coolant. In case of clogging, rinse the radiator through with clear water. Tighten sealing plug 2. Filling/venting the cooling system: see section 6.3.8 Be careful when draining hot coolant - danger of scalds! Collect drained coolant and dispose of according to envi- ronmental regulations. 1 !
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