Hi guys,

Interesting head scratcher for the group.

On MAX AC or fan full speed, the heater/AC blower fan changes speed. Up and down a bit, the speed indicator doesn't move, but it's noticeable. On lower speeds you have to listen for it, but it fluctuates. The X5 has ~310,000km, I've had it since 180,000 and never done the FSR so I assume it's original and due for a replacement so it was on the list.

Here's the weird part. If I'm driving at a decent speed (80km/h or 50mph) and I move the steering wheel to the left maybe 10 degrees, the blower motor picks up speed. This is repeatable, but only with the slight left turn of the steering wheel. I noticed it at first on a long sweeper on the highway, now I can repeat it all the time. Any this isn't a hard sharp 10 degree jerk of the wheel - just a slow drift and back to centre. Doesn't happen turning wheel to the right.

What on earth would the connection be between the steering wheel angle, and specifically that angle, and the FSR/blower speed?!?

FWIW, I have replaced the ignition switch and IVM module about 35,000km ago. Alternator about 5,000km ago. I noticed the fan fluctuations tail of last summer but thought I'd wait for FSR to give up and fail before diving in.

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