DBW 2010 / 2016 2 General Description
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2.12 Fan thermostat
The fan thermostat switches the original vehicle heater fan
off or on when the coolant temperature is between 30 °C
and 40 °C. The thermostat closes at 40 ± 3 °C and opens at
30 ± 5 °C.
2.13 Circulation pump
The heater must be operated with a circulation pump.
The externally positioned circulation pump ensures the
pumping of the coolant in the vehicle and/or heater circuit.
The pump is switched on with the control unit and runs dur-
ing the entire operation of the heater.
Fig. 218 External control thermostat
Fig. 219 Fan thermostat on heater
Fig. 220 Fan thermostat in coolant circuit
Fig. 221 U 4840, suitable for DBW 2010 and DBW 2016
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