300E 4MATIC (124.230) L6-3.0L (103.985) (1990)
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Blower Motor Resistor: Description and Operation
Function of Blower Regulation With Various Function Selections
The blower regulator permits a continuous blower speed regulation. The blower regulator is connected to the main fuse box and ground and is supplied
with battery voltage as soon as the ignition has been switched on. In addition, the blower regulator is connected to the automatic climate control unit by
means of a control cable. Depending on the function selection of the blower switch, the control unit continuously sends a control voltage of between 0.4
to 9 volt to the blower regulator. The regulator continuously supplies a current between 2.0 to 28 amps to the blower motor, in this way regulating the
blower speed.