Hi folks, I changed the fusebox in my coss for a nearly new one (proper high spec cosworth fusebox) but my heaters no longer work.

Im getting a live feed through the fuse but im not getting one at the switch??

When i turn the dial i cant hear the fan running but im still getting hot air through the vents when im driving but this doesnt usually happen untill im sitting at about 60-70 on the motorway Anyone any ideas???