When I bought my 72z it had a crack in the radiator. I had the radiator repained, but it would still get up to almost 250 degrees. Then today I replaced the thermostat with a 170 degree one from nissan, which helped a little. It still gets up to around 230 degrees. Both hoses seem very pressurized when it gets warm, like something may be blocking the flow, but thats just a guess. Help Please!