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Originally Posted by noncom23
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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Not sure if this is related, but when I drive on a highway 65mph+ I hear a whining sound also. It's especially audible when the car is in cruise control. It sounds like a contunous and steady a small rev-up, a small wind down sound... Complete cycle lasts about 3 seconds. Any ideas?