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BMW
525i
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Blower Final Stage Fan Resistor May Fail on BMW 525i

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
RepairPal Verified
Average mileage: 121,763 (70,000–222,000)
5 model years affected: 1994, 2001, 2002, 2003, more2007
31 people reported this problem
Comments
Viewing 1 - 19 of 19 comments
the fan sometimes on, sometimes off,and now it's dead not on at all. Is it the only possibility that blower final stage resistor need to be replaced? or there's other possibility like fan motor?
When the car is turned off the floor vents blow hot air including my arm rest vent. I get no light on any of my ac buttons. I thought it would be fuse 9 or 20 but they look fine. I take 9 out and the blower stops of coarse. The only think I can think of is the big porcupine looking fuse on the passenger side under the vent on the floor. Is it an FSU problem?
Final stage resister failure caused fan to continue to draw power after shutting off car. The battery would drain and the alarm would then trigger when set.
blows hot air under the dash while driving and the cluster that controls ac/heat doesnt work at all
Buy the part from Rock Auto (<$40) and go on line and replace it. It takes less than 5 minutes. The repair location is under the passsenger side, unclip and remove and replace. Works like a charm, BMW wanted $200+ to replace.
It randomly started. Would turn the car off, the blower would stay on and eventually run the battery down. I haven't had it fixed yet, but in the meantime every time I park I have to get into the trunk and unhook the battery cable so it doesn't run down the battery.
*I coun'nt figure out why cars battery kept on dying and fans blower would come on and not shut off when you needed it to until I replaced the blower final stage unit, all is back to normal, Thank God..........
The blower fan wouldn't cut off and was constantly blowing hot air in the cabin. I took it to one repair shop and they only disabled the fuse and told me I needed a new control module. I took it to another non certified mechanic and they replaced the control module, but the blower fan wasn't turning on
My blower motor stays on even after the car is turned off causing the battery to die out. I need to shut it off how do i do so?
Not fixed yet, fan blows cold on face only when heater on, but will be hot at feet or defrost. Defrost will stay on or turn on after engine shut off.