Hi. Thanks for the reply.

No engine lights on the dash. Not checked for any codes.

Also if it was intake boot, pulley or tensioner, then i would hear the whistling in the engine bay, but this is coming from inside the cabin, while the fan blower is off also.

I have only had the car 2 months and it had a full MOT and service done before I bought it, all the hoses look pretty new. It has 107k miles on the clock.

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2012 X5 30d