T230 XL LWB Tdci (57)....Van runs great........Starts fine in icy , cold or hot weather.......But as soon as it gets to running temp and I turn it off it will not start till cold again...about 2 hrs later.......My garage the ford dealer and a diesel fitter cant find a fault.........Injectors tested...Fuel pump tested all ok...................Its driving all of us mad......HELP