Demister not working

[JonN]

Hi everyone, I have a 2003 K12 that I bought in July - all is good but it seems the demister isn't working. There are no visible breaks in the lines on the rear window, so my first thought was the check the fuse, but I'm not sure which one to change, none of the fuses in the dash compartment seem to labeled as being for the demister. Any advice?

Thanks Jon