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  #1  
Old 07-18-2019, 06:36 AM
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FSR head scratcher...

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!
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  #2  
Old 07-18-2019, 08:19 AM
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Facelift cars don’t suffer the final stage woes that the pre face lift do. So I’m not sure that would be it.

Now the steering, depends on age and mileage, could be the clockspring.
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Old 07-18-2019, 08:33 AM
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Had similar thoughts on FSR. Any idea on the connection between blower speed and clock spring? How would anything in the steering wheel and associated electronics be connected to the blower speed?
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Daily Drivers:
- 2004 X5 4.4, 01/2004 production, 315,000km
- 2008 535i, 230,000km

Track:
- 1996 328i, track/race car, ~300,000km

Winter:
- 2001 Ski-Doo MXZ 600 w/800 engine, exhaust
- 1978 Ski-Doo Olympique 340 (vintage race sled)

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Old 07-18-2019, 08:48 AM
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Look at your voltages, could be a weak battery or alternator. Also check your accessory belts and tensioner.

Applying a slight load to the power steering pump is whatís happening when youíre turning the steering wheel. Iíd start looking in the engine compartment instead of the cabin.

Just pray itís not a terrible obscure electronic issue.
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Old 07-18-2019, 09:48 AM
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You are describing a worn blower motor. As you take turns the armature shifts in the worn bearings


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Old 07-18-2019, 10:09 AM
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Quote:
Originally Posted by andrewwynn View Post
You are describing a worn blower motor. As you take turns the armature shifts in the worn bearings


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That's exactly what I was thinking when reading that the blower speed changes based on the vehicle turning. This points to a worn bearing...and also indicates which side since it only occurs when turning towards the left.
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Old 07-18-2019, 10:21 AM
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You may be able to punt replacement if you can drill a hole in just the right place to get some spray lube on that bearing but I would start planning the day long process of dash removal to replace the blower


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Old 07-18-2019, 11:37 AM
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Quote:
Originally Posted by andrewwynn View Post
You may be able to punt replacement if you can drill a hole in just the right place to get some spray lube on that bearing but I would start planning the day long process of dash removal to replace the blower


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Omg, those are so much fun.



Last one I did in an E36. Wasn't so bad. The X will be a lot worse.
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Old 07-18-2019, 11:46 AM
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It's such a gentle turn that does it. I try doing it so softly that I'm not slamming the fan one way or another, but maybe that's enough centripetal force to drift the blower to the right. My 535 has the squealing blower and hard braking/corner definitely does it, but that is squeak, not fan speed variations like this.

I'll monitor voltage reading through the dash and keep an eye under hood. The correlation between the two makes me think something other than FSR. I'm not accepting the motor bearings, I won't, I won't
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Daily Drivers:
- 2004 X5 4.4, 01/2004 production, 315,000km
- 2008 535i, 230,000km

Track:
- 1996 328i, track/race car, ~300,000km

Winter:
- 2001 Ski-Doo MXZ 600 w/800 engine, exhaust
- 1978 Ski-Doo Olympique 340 (vintage race sled)

Reply With Quote
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Old 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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