S 420 (140.043) V8-4.2L (119.981) (1996)
Control Module HVAC: Description and Operation
Rear Blower Regulator (Models with Rear A/C)
The blower regulator regulates the power supply for the blower depending on the blower stage set.
The blower regulator is actuated via a control voltage of 0 - 6 V according to a curve stored in the pushbutton control module. In the manual mode,
actuation is subdivided into 7 stages. This allows regulation of the blower speed from 0 - 100 %.