i just fixed my serpentine belt and pulley now the vents have no intake, i have checked the fuses and all seem to be fine, before i fixed the belt and pulley the vents had hot/cold air coming out, what could cause this? I have had someone listen to it and they said they can hear the fan trying to turn on and said it could be that, today i checked again and as i turned the car off you can hear a hiss coming from the fan towards the front dashboard as if air is leaking out? please help me..