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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > cooling fan malfunction



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      06-30-2016, 03:27 PM   #1
heyzoot
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Drives: BMW 335I
Join Date: Dec 2012
Location: VA

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cooling fan malfunction

'08 335 e93
Cooling fan won't come on -- as a result hard shifting and A/C compressor wont engage.
yellow temp warning so turned off engine and let cool down.
temp circuit (maxi) fuse blown replaced and immediate blows another -hard short.
No fault codes thrown.

unplug fan and next fuse still blows.
turn on car and signal wire reads ~4.3 volts.
remember youtube video of guy whose fan wire coating cut inside electrical tape on top of radiator that powers fan.
unwind tape to reveal short (although it wasn't touching metal (fan shroud is plastic) or another wire as their coating was intact. -very strange) Many wire strands broken so wire as effectively thinner at that point.
Replaced bad section with connector (glued ends for moisture repellant) and re-taped wires.

Inserted new fuse everything back to normal (shifting, a/c and fan)

Hope this helps someone else.
Appreciate 0
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