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Old 03-20-2017, 01:04 PM   #1
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Join Date: Mar 2017
Location: Olympia, WA
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My Ride: 1999 323i
Burning through FSU's & related issues

When I bought my '99 323i the blower was stuck on and the fuse box had been soaked from the car sitting under a tree and pine needles clogging the drainage.

I've installed two new FSU units, one cheaper one and a more spendy Behr. Both worked for the first few minutes then died. Both also got very hot beforehand.

I've been doing some minor driving around town as I mess with things. Fuses and relays were removed, everything dried out and cleaned with foaming contact cleaner.

Car starts right up with new battery, but as I drive I get occasional loud clicks, guessing from a relay and check engine light for p0735 (gear 5 incorrect ratio) and p1250 (fuel pressure regulator).

Hoping anyone has dealt with similar. I'm really hoping the transmission error is related to the electrical issue and not a mechanical problem in the tranny.

I've read plenty on replacing the fsu, but nothing I saw mentions burning new ones up immediately. Thanks!
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Old 03-21-2017, 06:26 AM   #2
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Join Date: Jul 2008
Location: USA
Posts: 6,194
My Ride: 2001 330Ci
A burned FSR/FSU is caused by too much current flowing threw it. You likely have a bad blower or a short in the wiring.
markusmarkus is offline   Reply With Quote

electrical, fsu, p0735, resistor, transmission

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