2003 Pontiac Aztek 6 cyl Front Wheel Drive Automatic 120345 miles
When I start my engine it hisses and as I go thru out the day it does not stop. I spraye WD 40 on it, but it will only stop it temporarily. What can it be. I checked the belt and it is not frayed or cracked as far as I can see. It only does the noise loud when I accelerate. What do you think it could be.