We have a 2002 S60 Volvo(not turbo charged) that makes a whistling(sucking)noise on 2002 Volvo S60

We have seen a fix for a turbo charged Volvo, but this car is not turbo charged. The other fix was for the PCV valve. Please help

Asked by for the 2002 Volvo S60
1 answer
Vacuum leak someplace. Have it smoked or mechanic check it.