So the last couple times i've been pulling the holiday trailer every once in a while when going up hill or even sometimes on flat ground this sound comes from the front of the truck and it sounds like a really loud wind noise. Ive been doing some searching and could it be a pulley bearing or a cracked PCV valve? it seems to do it most often when the engine is under load and once in a while when its not pulling anything just going down the highway. Any other ideas or anybody had the same nouise/problem?

 

I have noticed this as well. What I am hearing sounds like its coming from the rear though...

 

Check the fan, when the clutch fails the fan becomes straight drive off the motor and will cause a loud air noise upon acceleration.

 

fan clutch or it could be the cmcv's operating to allow for additional torque....

 

how do i check the fan or know if the clutch is gone? Thanks

 

Anybody??