I am just getting into welding and I am thinking of buying mw220 from a friend of mine. It was her husbands before he past. I brought it home to do some test welding the other night. When I plug it in and fire it up the fan does not come on. I welded a small bead it welds nice but I am concerned about the fan. I dont know if it comes on later of what the deal is. if any one has manual that would be great.Thanks