mondeo estate 1995 lx 1.8 diesel turbo (none starter)?

This mondeo is a sluggish starter,use to run well when up and running, recently run out out of diesel and car when re filled wouldnt restart, garge fitted new fuel filter and it seem to fix the problem, since then it over heated but didnt ever reach the red zone on clock but 3/4,the mondeo then cut out and hasnt started since, any ideas as into what i can try to start this vechile again, some say the vechile may hold a safty cut out device on it if so where is this device as im wondering now if this kicked in when car got hot due to a rad leak.