Blower Final Stage Fan Resistor May Fail on BMW 540i

Problem Description and Possible Solution

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.

Problem Data
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Average mileage: 110,600 (10,009–202,000)
7 model years affected: 1997, 1998, 1999, 2000, more2001, 2002, 2003
19 people reported this problem
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Viewing 1 - 7 of 7 comments
Blower motor continues to run even with the ignition off, and key fully removed. (it's really freaky).

Found parts online $60, readily available. (My local dealer, BMW Concord, CA. quoted me $193 for the part), found video on YouTube how to replace, took about 20 minutes.
Fan just won't turn on although the lights for it show it cranking.
Blower resistor went out, fan control eratic. Replaced for $70
Continuing running of the blower after car is turned off. Only 2 speeds of blower; on or off. Cold or hot.
Dealer replaced fan transistor (I think) due to intermittent failure.
Fan speed allways on low.
Caused battery to go dead. Replacing part fixed problem