Blower Final Stage Fan Resistor May Fail on BMW 328i

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.

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Average mileage: 119,318 (64,000–218,000)
6 model years affected: 1997, 1999, 2000, 2007, more2008, 2015
25 people reported this problem
11 people shared problem details
2007 BMW 328i124,323
Fan not blowing when the heart or air condition is on.
The air conditioner would work, and you could tell it was cold but the air would not blow out of the vents. Also this would happen off and on for about 6 months. The air conditioning would work and blow cold air, then it seemed like on the really HOT days it would not blow the cold air at all, so i had enough!!! Replaced the final stage transistor and Yeah that fixed the problem!!!!!!!!!!!
2007 BMW 328i73,000
Taking to the dealer on Monday.
2008 BMW 328i64,000
Blower intermittently would shut off, and fan speed was sporadic. So I opened the FSU or (final - stage - resistor unit) to find that one of the prongs to the main power connector was shorting causing the prong to partially disconnect from the circuit board. Possibly moisture could have been the cause!
2007 BMW 328i96,000
The AC fan blows at random speeds without being touched. The air coming out is cold, but set on maximum, it will blow hard and then soft then somewhere in the middle and fluctuate the entire time you are driving.
2008 BMW 328i99,000
Heater not blowing
1997 BMW 328i160,000
A/C starts and stops unpredictably as if a connection is loose. Perhaps I will have to try replacing the final stage fan transistor whatever that is.
1997 BMW 328i90,000
sometimes fan doesnt work
1999 BMW 328i102,090
Blower goes on intermittently. They want to replace whole resistor for $400+
1997 BMW 328i143,000
the a/c would turn on when it wanted,first i thought it was a loose connection point, wrong! I'm now going to replace the final stage resistor, pray to god. I live in Las Vegas, and it's HOT!!!!!
1999 BMW 328i212,000
AC/Heater fan only works sporadically and almost never when you need it. No solution
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