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Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor on Mercedes-Benz S420

Problem Description and Possible Solution

Other than a defective motor, a bad switch or blower motor resistor assembly can cause an inoperative heater blower motor.

Problem Data
RepairPal Verified
Average mileage: 138,700 (138,700–138,700)
6 model years affected: 1994, 1995, 1996, 1997, more1998, 1999
8 people reported this problem
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No heat when heat setting is on. What would make the resistor assembly go bad and what do I need to do
Decreased blower efficiency.