Mike,
It's normal for the radiator to be under pressure when the engine is operating. Even some gurgling of the coolant into the overflow tank is normal. However, excessive pressure is not normal. This may be as simple as a bad coolant thermostat.
TimK
85\' GMC Sub, 4x4, 3/4Ton, 6.2L Diesel<br />67\' Land Rover Series 2A, 2.5L Diesel<br />00\' VW Beetle, 1.9L Diesel TDI <br />90\' Range Rover - soon to be Diesel<p>So what do you do with gelled Diesel fuel? Smear it on toast and have another cup of coffee until it gets warmer outside.