for some reason, when i have the heat or ac on, it sounsd like a little rattling noise coming from inside the car. Its not terribly loud, but its loud enough to hear and be annoyed by it, plus im nervous that it might be a problem. The noise is being made on any of the 4 levels of air control, and im pretty sure that it doesnt get much louder on the 4th than on the 1st, but i could be wrong. I believe tho that the rattling noise accelerates when turned up.
if anyone knows what could be wrong, plz let me know

thanks

 

well 3 things come to mind ..one ya got something in the fan area making the noise..like something was drop down the defroster holes 2nd the bearing is could going bad in the motor or 3.... the fan blade is hitting something