its the fan that's caused all the problems. started some time ago with jammed fan....fixed that and tested by shorting it with paperclip across terminals...all was well and fan worked...recently fan stopped working again....sparky said there was a dead short in fan, 30amp fuse was blown and switch on side of rad was shot...i must confess i was a bit surprised it was fan,fuse,and switch all at same time so plan is to take bumper off (it needs re-lacquering any way)so i can see what I'm doing and after replacing fuse test fan again and if it don't work then , following your advice, remove rad and replace fan and switch at same time. one last thing though...where is bleed nipple?