BMW 540i Problem Report

BMW 540i Blower Final Stage Fan Resistor May Fail

(17 reports)

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.

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. -
Blower resistor went out, fan control eratic. Replaced for $70 -
Fan just won't turn on although the lights for it show it cranking. -
Dealer replaced fan transistor (I think) due to intermittent failure. -
Fan speed allways on low. -
Caused battery to go dead. Replacing part fixed problem -
Related Items:
heater blower motor willnot cutoff anwhereit locate
Everything is working but there is no air coming out at all
is there a way to test the fan to see if it works befor i put on a new one?
Wat Are fuses 75/76
My ac/heat seems to work okay and I can hear the fan running but the air flow is very poor. I...