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#1
07-18-2019, 12:05 PM
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There are gyroscopic forces infolved because of the spinning. It takes very little twist to impart a lot of force one way or another. It's not about moving the armature along the rotation axis. Your description makes me more sure it's the blower bearing
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) 
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#2
07-18-2019, 12:21 PM
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I experienced blower speed variations that were caused by an overheating FSR that melted the harness connector. Depending on ambient temperatures and electrical load through the connector, the voltage varied to the motor as the connector resistance changed.
2002 X5 3.0 361,200 miles 2014 428i 63,900 miles 2004 325i sold at 123,600 miles 2001 325i sold at 66,000 miles 1970 Firebird under restoration - engine dyno run in August
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#3
07-18-2019, 12:37 PM
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And it's only that subtle turn left that does it. No other turn or spot on the steering wheel (right or left) can I get it to be repeatable. Agree on the gyroscopic forces.
I'll keep an eye on it along with other suggestions. Might change FSR to eliminate that variable.
__________________
Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E 
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#4
08-01-2019, 09:51 AM
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Getting worse now. Sounds brutal and mechanical (it is definitely the fan). I'll try to remove the intake plenum from the engine side to see if I can lube the bearings. I have it booked at my indy for Aug 15. Book says 6h. We'll see
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Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E
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#5
08-01-2019, 11:32 AM
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"While they're in there" the FRS will get replaced. I'll shoot some grease at the bearings this weekend and see what happens. I'll keep you guys posted.
Thanks!
__________________
Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E
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#6
08-16-2019, 06:52 AM
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Update.
Indy did the fan and FSR yesterday. Pretty much spot on to the 6 hours for the entire job. He did remove the steering wheel (which was ok, seeing as when I put it on last I was out by a tooth and it was REALLY annoying me ).No amount of lube would have fixed the fan. The bushings were worn right down to the holder and wearing it out. Hard to see, but the front of the pics show some bushing material, but at the back there is none. Works beautifully now. Cheers.
__________________
Daily Drivers: - 2008 535i, 320,000km - 2004 X5 4.4, 01/2004 production, 420,000km - 1997 328i, 350,000km Track: - 1996 328i, track/race car, ~300,000km Winter: - 2013 Ski-Doo MXZ X 800 E-TEC, trail can - 2007 Ski-Doo MXZ Blizzard 800 HO - 2001 Ski-Doo MXZ 600 w/800 engine, exhaust - 1978 Ski-Doo Olympique 340 (vintage race sled) - 1977 Ski-Doo Olympique 340E
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