Hello dear community, I have been the proud owner of a vw phaeton 2012 bj 3.0 tdi for 3 weeks. I noticed with the thick that when the engine is running on the driver side comes a light air hissing out of the engine compartment. When I turn off the engine it hisssssssss about 2-3 seconds after. I was the friendly around the corner he meant his completely normal. Also another mechanic told me I did not have to worry about it. It is not on the drive again I feel nothing unusual with the driver. I first had worry that it is the brake booster however he likes to brake and the engine number behaves completely normal. Can someone tell if this is normal or I should still get some advice in the from which I have a photo from which area the noise comes. I thank you in advance and wish a nice and relaxing weekend!