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| Because the heater coolant shut-off valve -N279- (optional) will be actuated depending on the coolant temperature and only with the auxiliary heater switched on, the auxiliary heater must be switched on during the bleeding procedure. |
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| Air in the coolant circuit or the auxiliary heater can cause the auxiliary heater to overheat. The fault „control unit defective“ will be stored in the auxiliary heater. If this fault occurs several times in a row, the auxiliary heater will be blocked electronically. This blockage can be removed using the vehicle diagnosis, testing and information system -VAS 5051B- or a later model. Start the function „adaptation“ in the vehicle diagnosis, testing and information system -VAS 5051B-. |
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| Switch on engine and then auxiliary heater. Press, for example, the instant heating button -E537--1-. |
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