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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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Old 01-28-2013, 12:53 PM
Daveyboy816 Daveyboy816 is offline
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Location: New York City
Join Date: Jan 2013
Posts: 4
Mein Auto: 08 328I convertible
Repeated FSU failures 08 328I convertible

I am experiencing repeated FSU failures in my 08 328I convertible. I am going on my 5th replacement. The replacements work well for a short time then quit. Heater fan will not turn on at all. The FSU shows burn marks at the spade terminals. Could it be the quality of aftermarket replacement parts? It could be. Is there a difference in the units that BMW dealerships sell? These units do run up in temperature being resistor units, maybe insulation quality is not up to par. However I have a dealership vs internet replacement both with the same problem (burn marks at the spade terminals). What gives? Anyone have a photo of the wiring harness attachments to the FSU so I can make sure there are no factory wiring screwups. Factories make wiring errors all the time. Are resistor units polarity sensitive? If the red and brown wires were inadvertently reversed for example?
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