The blower final stage fan resistor is known to fail. Symptoms are the heater fan speed varies regardless of the setting, the fan will not turn off when the car is switched off, or the fan will not switch on at all.Google+
Car Problem Reports
BMW 330Ci Blower Final Stage Fan Resistor May Fail
BMW 330Ci Problem
Average Mileage: 113,500 mi (77,000 mi - 161,000 mi)
Visitor, 2001 BMW 330Ci, 110,000 mi
The problem beagn with an erratic performance of the blower motor. It would run at different speeds and ultimately would not shut off even with the key removed, folowed by an electrical burning smell and then nothing would work. It was the final stage unit (aka the fan resistor) $220.00 to fix at the local gargae.
Visitor, 2001 BMW 330Ci, 141,000 mi
will not change speeds and stay on high and get too hot or dont come on gets too cold
Visitor, 2001 BMW 330Ci, 90,000 mi
Speed varies regardless of the setting.
Visitor, 2001 BMW 330Ci, 154,000 mi
Buring smell, MPG fluctulates.. Passenger window moves, windows break! ugggg
Visitor, 2001 BMW 330Ci, 161,000 mi
A/C fan speed fluctuates regardless of setting. Purchased replacment final speed unit from Pelican Parts for $29.00 and replaced myself in under an hour. While replaceing unit, noticed evidence of the part being previously replaced, so this may have been the second failure since new. ( I am second owner )