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: 102,622 (900–219,726)
10 model years affected: 1997, 1998, 1999, 2000, more2007, 2008, 2010, 2011, 2013, 2015
39 people reported this problem
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Viewing 1 - 20 of 21 problem details
2007 BMW 328i 124,323 mi,
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!!!!!!!!!!!
2008 BMW 328i 64,000 mi,
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!
1999 BMW 328i 107,000 mi,
Blower Final Stage Fan Resistor May Fail on BMW 328i
2008 BMW 328i 99,000 mi,
Heater not blowing
1997 BMW 328i 160,000 mi,
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.
1999 BMW 328i 102,090 mi,
Blower goes on intermittently. They want to replace whole resistor for $400+
2007 BMW 328i 73,000 mi,
Taking to the dealer on Monday.
1997 BMW 328i 143,000 mi,
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!!!!!
1998 BMW 328i 165,000 mi,
Air suddenly stopped coming out of vents one day. Sounds like it is trying to work but nothing comes out. My dad looked at the gauges inside to test them and as he put them back, ready to try something else, it suddenly started to work. By the next day, it wasn't working again.
1997 BMW 328i 90,000 mi,
sometimes fan doesnt work
Didn't use the AC during the fall that much, and not at all during the winter. Tried using it for the first time about a month ago, and it works intermittently. Usually works if I keep the fan speed low and when it's not too hot outside. When it's 70F and above, it just blows out warm air. I'm going to try replacing the final stage resistor. Hope it works!
Same issues. Replaced my resistor just over 14months ago and now i need to replace it again.
2011 BMW 328i 42,000 mi,
Air and heat blower is doing its own thing. It goes high to low constantly. The biggest problem is that it stays on after the car is shut off.
2010 BMW 328i 77,000 mi,
No a/c and heater coming out.
2015 BMW 328i 900 mi,
Neither the heater or A/C is blowing air. I live 150 miles from the dealership and what really irks me is that I only have 900 miles on the car!
2013 BMW 328i 47,000 mi,
Air shuts off when after being driven for a couple of hours. Then will come back on after a while.
2015 BMW 328i 3,827 mi,
Air conditioner on but no air blowing. Brand new wagon.
2011 BMW 328i 60,000 mi,
the fan does not blow at all for the air conditioner or the heat, I am taking it to the dealer on Monday. Im hoping they will say its covered under warranty.
2007 BMW 328i 96,000 mi,
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.