Another suggestion...

What mine was.




OK. My 4.4, 06', started whinning at about 1500mis. Took it in and here is the result:

" Evaporator drain tubes contacting driveshaft and transmit noise through cabin.
Test drove to verify complaint. Per SIB 64 18 05 Installed valves at end of both drains. Test drove again to verify noise no longer present.
Part 54-10-7-070-130."

Well it worked. No more noise. Not sure if this helps anyone else.
I will look up the part in BMW OEM.
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Mike F
Current: 2017 Grand Cherokee HEMI
2017 Kawasaki ZX-14r
2017 Harley RG Ultra
2017 Harley Fatboy S