Erratic HVAC Blower Motor Operation on Mercedes-Benz E320 4MATIC

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.

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Average mileage: 112,500 (110,000–115,000)
6 model years affected: 1998, 1999, 2000, 2001, more2002, 2004
8 people reported this problem
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problem details
Strange erratic blower and A/C functions. Sometime it would blow strong but then stop, then back to strong with very little change in car cabin temperature or A/C settings. Only happens when using cold AC.
Sometimes the a/c does not turn on, other times it does.