The way this fuse blew is interesting.
I rarely need to set the heater control to max demist because of the heated screen, but I did this morning to help in the -4 C temp. As we know the air con will start when you do that but the book says the air con won't work if the temp is less than +4 C. Well my air con did start, the compressor was clutching in and out and it was trying to start the fan, but couldn't because the fan was jammed solid with ice. First I knew of a problem was smoke from the front of the bonnet and an electrical burning smell. Hopefully the fan motor will be OK, but I can see the fuse has blown.