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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 01-28-2013, 12:53 PM
Daveyboy816 Daveyboy816 is offline
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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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Old 01-28-2013, 01:28 PM
jburke4689 jburke4689 is offline
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What is an "FSU?"
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Old 01-29-2013, 10:48 AM
invisihitch invisihitch is offline
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Mein Auto: 2012 X3
Repeated FSU failures

I think Jimbo Fisher is the source of such failures.
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Old 01-29-2013, 01:54 PM
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fun2drive fun2drive is offline
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Typically when I have seen this failure it is ALWAYS the fan pulling way more amps and the fuse will not always fail to protect it.
I would also use a good dab of dielectric grease to improve the connection because DC arcing isn't normal at all. I would imagine replacing the fan is a PITA as is the case in all 3 series BMWs.
Multiple FSU failures points right to the fan...
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Old 01-29-2013, 03:09 PM
mr_bean mr_bean is offline
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Quote:
Originally Posted by fun2drive View Post
Typically when I have seen this failure it is ALWAYS the fan pulling way more amps and the fuse will not always fail to protect it.
I would also use a good dab of dielectric grease to improve the connection because DC arcing isn't normal at all. I would imagine replacing the fan is a PITA as is the case in all 3 series BMWs.
Multiple FSU failures points right to the fan...
+1

I bet if you drove around long enough with the fan on the max setting it will blow the fuse.
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