I just got the oil changed in my truck and the fuel system cleaned. But now I am hearing a loud and constant whistling noise. I think it may be the belt cause its the original, but i have no idea what else could be wrong please help

 

Sounds like a vacuum leak. Check to make sure all the little hoses are plugging in tight.

 

Its all tight im just gonna go ahead and change the belt (hopefully that will fix it)

 

yo i have the same problem bro... i got a whistling noise and i think its my belt but im not sure... it sounds like it could be the brakes scrubbing too... it sounds pretty wierd... i dont know what the hell it is... did u change the belt yet man? did that solve it... maybe me n u have the same probs....

 

Yeah I put a gatorback belt on it and the noise stopped.

 

aftermarket CAI can make a whistle as well...