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Update. I resolved the uneven air temps with a negative terminal pull for 1 hour (I reset the Adaptive Transmission and it made a HUGE improvement, so I wanted to reinitialize the entire vehicle).
The whistling is gone and I still have a little fluctuation in fan speed which I will address soon with the FSR DIY.
I just wanted to make sure this information was up to date for any future issues being able to get resolution with a free and simple fix. My suspicion is that I had sticking flap(s) somewhere that were fixed by resetting the system.
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2010 X5 35d
2000 M5 Sport
1999 BMW 540iA Sport
1991 Toyota Pickup - Survivor Garage Queen
2007 750i Sport - SOLD
2007 335i Sport - SOLD
2004 BMW X5 4.8is - SOLD
2004 A4 UltraSport Quattro Manual - SOLD
2001 A6 2.7T Quattro - SOLD
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