I was in the middle of a 150-mile trip when I started noticing an air noise coming from my left in dash vent during acceleration (34,000 miles on truck and I have never noticed this before). I shut the radio off and shut off all of the heater controls but it did not change anything. I put my hand over the vent and it felt like there was a slight suction during acceleration (I am not certain if it is a suction or not I am going to test it with smoke later today). This air noise drowns out the turbo whine on acceleration. Any ideas or suggestions?
02 Chevy LT K2500HD Dmax/Alli EC SB Green tan leather, Amsoil fluids throughout (dual by-pass oil filters & air filter) Putco 4