I ran into a problem that I haven't had to deal with with any other snowblowers I've owned or used in the past. I have a JD 522 that is new to me this season. I used it this past weekend and it ran great, but tonight when I went out to clear the couple of inches we got the impeller was iced up and frozen solid. There is about a 1/8" gap behind the impeller that snow from last weekend got packed behind and froze tight. After I figured out what was going on I used a propane torch and melted the ice and all was fine. Has anyone run into this in the past, and what did you do to help prevent it?