I have a 1998 Newmar Mountain Aire front Diesel. The dash blower keeps blowing the fuse. It does not matter what mode of operation it is in, heat, or AC. When I replace the fuse, it will run for approximately 20 minutes and then blow. I have looked at the motor and wiring but cant find anything wrong. The motor does not get hot, and does not make any unusual sounds. Any one else had this problem? Thanks in advance.