Mercedes-Benz 420SEL Problems

Bad Switch/Blower Motor Resistor Assembly May Cause Inoperative Heater Blower Motor on Mercedes-Benz 420SEL

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.

(9 people reported this problem)

Mercedes-Benz 420SEL Vehicles With This Problem

RepairPal Fair Price Estimate
RepairPal Verified
Average mileage: 179,100 (145,000–230,000)
2 model years affected: 1990, 1991
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Viewing 1-3 of 3 comments
when I place in key and start to turn car on blower will come on sometime when I start the car blower goes off most of the time the blower does not come on at all.
the blower motor was rewplaced 2 years ago and it quit working but i hear noise when i push buttons on air condition compressor is fine no air comes out of the vents