2 weeks ago i bought a new /used 2009 mazda 3 "i" sport 4door sedan.... haven't had really any problems until today.. The problem is the air compressor seems to be turning on and off a lot and the "round" spin pulley isn't spinning only when it kicks on(dont know much about cars 
....). my fan is also really loud it seems to "me." now im usually used to a V6 engine so this 4cylinder is new to me..... but i thought that the "spin pulley" air compressor would stay on for a long time or always(not on and off on and off)also i'm idling while im doing this. Let me know if you have the car and / or are a mechanic or something to help me out before i go to the dealership....
just seems really loud period and again the air kicks on and off on and off
....). my fan is also really loud it seems to "me." now im usually used to a V6 engine so this 4cylinder is new to me..... but i thought that the "spin pulley" air compressor would stay on for a long time or always(not on and off on and off)also i'm idling while im doing this. Let me know if you have the car and / or are a mechanic or something to help me out before i go to the dealership....just seems really loud period and again the air kicks on and off on and off