2004 Pontiac Grand Prix air blower

ONE DAY I STARTED MY CAR AND THE BLOWER FOR THE AIR AND HEAT STAYED ON AND WOULDNT SHUT OFF. SO I STOPED BY A GARAGE AND THEY UNPLUGED A WIRE AND SAID AS LONG AS IT IS UNPLUGED NOTHING SHOULD GO WRONG. THIS WIRE WAS AT THE BOTTOM OF THE DASH. I PLUGED IN THE WIRE A FEW DAYS LATER AND THE BLOWER NEVER TURNED ON BUT I HEARD LIKE A FRYING SOUND AND A LITTLE SMOKE SO I PULLED IT APART. THE CAR HAS BEEN RUNNING FINE AND IF I RUN AT HIGHER SPEEDS AIR GOES THROUGH AND IS COOLED BY THE AIRCONDITIONING OR THE HEAT WORKS. I JUST CAN NOT GET THE BLOWER TO BLOW OUT THE AIR. I WANT TO FIX IT BY MYSELF SO DO IN NEED A NEW BLOWER AND IF SO HOW DO I FIX IT AND WHAT MIGHT BE THE COST OF ALL OF THIS. A FEW MONTHS BEFORE IT WENT OUT IT SEEMED LIKE LEAVES WHERE STUCK IN IT AND IT WAS MAKING SOUNDS.

THANKS

AARON