[mkIII supra turbo gav]

hi just bought a supra turbo mk3 and ive changed the water pump but it still over heats no oil in water vica versa and none out the back engine sweet n ticks over fine i removed the thermostat no luck there the temp gaue hit the roof tho but engine didnt skip a beat n i couldnt hear any bubbling from the front could some one please shed some light cheers gavin