6.4 humming and whistling

[Suzuki6mx]

Not sure where this would go but... 08 6.4 they pulled cab and put all back together and now underneath the dash somewhere there is a knocking,humming,tooting, and whistling sounds...it sounds like a song is being played... Any help please

[frankies31]

It sounds like one of your turbo hoses have cracked where the flex part of the hose is that is what mine did and they had to replace the pipe hoses to the turbo and it stopped. Check right behind the turbos just underneath the cab and windshield and see if thats where you hear it at.