[insanesam]

Hi All

Have a 335i 2008 model. Recently been hearing a weird noise after driving around for an hour then stopping the car and shutting off the engine. I've never heard this noise in 8 years of ownership. Usually I hear the water pump cooling the turbos when car is off. Refer to video

Its coming from near the expansion tank / water pump area. The car drives fine, no codes or anything else.
The sound goes away after about aa minute or two.

Assistance appreciated.
Sam