Strange noises getting worse on my 4.4 X5

[X5_Rules]

I have a 2005 4.4 and get the whistling noise too and I have narrowed it down to the fan (heating/cooling) being on in the vehicle. I can hear the whistling noise even when the AC is off, but the fan is still on. I told my dealer about this and I was told that it was the condenser, which I disagree with as I can still hear the whistling even when the AC is off (i.e. snow flake button is off).

Has anybody got this fixed?

I have read other threads which state that it might be the intake adjuster, do you think I am having the same problem?

Any help is appreciated.

Cheers