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| On vehicles with 6-cyl. engine, the coolant temperature in the auxiliary heater is regulated by the auxiliary heater control unit -J364- by actuating the heater coolant shut-off valve -N279- in such a manner as to attain the optimum heat output for the passenger compartment. |
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| At present, the circulation pump -V55- is not regulated by the auxiliary heater control unit -J364- but rather only switched on or off. At a later date, it is planned to install auxiliary heater control units -J364- which will regulate the delivery of the circulation pump -V55- as a function of the coolant temperature in the auxiliary heater (introduction not yet finalised). |
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| On vehicles with 4-cyl. engine, the heater coolant shut-off valve -N279- is not actuated at present. Vehicles manufactured up to Model Year 2004 may be fitted with a shut-off valve, but this is not actuated (the auxiliary heater control unit -J364- must be encoded accordingly). |
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| At the start of production (up to Model Year 2004), vehicles with 4-cyl. engine were fitted with the heater coolant shut-off valve -N279-. However, in view of the fact that cold starting problems may be encountered with these engines at very low ambient temperatures following auxiliary heating operation with a small coolant circuit (engine is only slightly pre-heated), the auxiliary heater control unit -J364- is to be encoded such that the heater coolant shut-off valve -N279- is not actuated. |
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| To assist the engine coolant pump, the circulation pump -V55- can also be activated with the auxiliary heater switched off → Chapter. |
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