Erratic HVAC Blower Motor Operation on Mercedes-Benz E320

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: 125,721 (28,000–400,000)
7 model years affected: 1996, 1997, 1998, 1999, more2000, 2001, 2002
30 people reported this problem
12 people shared problem details
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.
No forced air on heat or AC. Replaced Electric motor and blower regulator
I turn off the car and the air conditioning fan keeps running even if I remove the key.
Replaced sensor.
Blower ramps up and down in speed.
blower stop working and i replaced the motor and had the same problem i hope its the regulater
Speed of blower does not work
Ac does not blow hard enough at max but still blows correct temp.
Replace part fan regulator aprox 45.00
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.
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
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