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.Google+
Car Problem Reports
Mercedes-Benz E320 Malfunctioning Regulators May Cause Blower Motor Failure
Mercedes-Benz E320 Problem
Average Mileage: 92,480 mi (28,000 mi - 190,000 mi)
Visitor, 2000 Mercedes-Benz E320, 120,000 mi
Visitor, 1999 Mercedes-Benz E320, 90,300 mi
No forced air on heat or AC. Replaced Electric motor and blower regulator
Visitor, 2002 Mercedes-Benz E320, 30,000 mi
the a/c and heater have been an issue since i purchased the car. when it works its great.....but it is gettting to be less and less
Visitor, 2000 Mercedes-Benz E320, 80,000 mi
The blower motor stays on all the time, even when the key is out of the ignition. I looked on line and it is likely the regulator. I am going to check it, and see if it is blow, but I need to get a voltmeter. I will get one and check.
Visitor, 1996 Mercedes-Benz E320, 190,000 mi
blower stop working and i replaced the motor and had the same problem i hope its the regulater
replaced last year!