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The faulty FSU can do weird things and yes it can cause the blower to operate when key is out the ignition and cause battery-drain.
I dont know why....
I took the climate-control unit out of the dash today and opened it carefully. It was clogged with dust so i cleaned the fan and around the resistor carefully with a very small paint brush.
I've put the unit back into the dash and no problems so far....
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'01 E53 4.4i exe sport >155K-miles [daily driver] 
'00 E46 323i sport >90K-miles [sold]
'01 LR freelander 2.5 V6 >90K-miles [sold]
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