engine trouble?

we have a toyota lucida 2.2td 4 wheel drive import, we have changed rad as it was blow when we bought it and refilled system it continued to over heat so we removed thermostat and have bled system but it is continuing to pressurise and overheat as soon as it is started but starts no problem, it bubbles in header tank, there is no steam or anything coming out of overflow pipe and it shows no signs of water in oil and no white smoke out of exhaust please help