1998 Pontiac Bonneville Blower on, engine off

I had a problem with rats in my neighborhood and they decided to take food up into my air conditioner blower housing. I had no idea they could drag chunks of fruit with rinds and cactus flower parts up there. All of a sudden my air conditioner started making a loud crunching rattling sound. I pulled over and turned off the car because I didn't know what had happened. To my surprise this did not stop the noise so I unhooked the neg cable which worked. I called a friend and he said to pull the master relay next to the fire wall. I did and this worked so I could drive it. We took out the blower and cleaned it out but itstill won't shut off with the engine. Any suggestions?