Erratic HVAC Blower Motor Operation on Mercedes-Benz E420

Problem Description and Possible Solution

A malfunctioning HVAC blower motor regulator can cause the blower motor to operate below the requested speed or not at all. Updated regulators are available; the blower motor and cover need to be replaced at the same time to upgrade the system.

Problem Data
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Average mileage: 154,000 (99,000–245,000)
1 model year affected: 1997
6 people reported this problem
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Viewing 1 - 2 of 2 comments
Mercedes Benz forum had me use another resistor assembly,works good now.
Blower motor regulator replaced with S-class unit, in order to avoid replacement of blower motor as well.