Went to clear snow this morning and when I started the bobcat there was a loud screaming noise. I isolated it to the blower that is under the radiator. It is -20 so I put a heater to it to see if that would make a difference. Let it warm up for about an hour. Started it again and the noise was still there. It then all of a sudden stopped and I proceeded to clear snow. Well what do you know, the engine started getting hot. I got out and looked into where the air comes out on either side of the blower housing and no air. The blower itself was no longer spinning. My question is what could be broken?