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: 105,134 mi (28,000 mi - 195,000 mi)
Visitor, 1999 Mercedes-Benz E320, 90,300 mi
No forced air on heat or AC. Replaced Electric motor and blower regulator
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, 2000 Mercedes-Benz E320, 120,000 mi
Visitor, 2001 Mercedes-Benz E320, 34,000 mi
Blower ramps up and down in speed.
Visitor, 1997 Mercedes-Benz E320, 102,900 mi
I'm still ordering the blower motor and regulator. Hopefully this fixes the problem. I've the voltage going to the blower motor and it seems to be okay.
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, 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!