Lit549
Full Access Member
- Joined
- Sep 19, 2016
- Posts
- 186
- Reaction score
- 74
I have a 05 ppv tahoe,it was a texas trooper truck.It has the hydroboost brake setup (if that matters).I have a humming noise from 30- 50mph.Its very noticeable,i have checked all accesories for bad bearings,thougt it was tge alternator but after rebuild,its the same.Any ideas?It almost sounds like a mechanical fan but i have electrics.The noise is def from engine bay.It comes in around 30mph and goes away at 60mph but then its a high pitch whine.While its the loudest i can change the sound with throttle,put it in neutral (while its doing it) and it goes away.Im stumped!Maybe its something with the hydroboost setup????