I think its time to replace my radiator. My 85 300D (202,150 miles) is beginning to run warmer than normal and I have already replaced the thermostat and cap and had the system reversed flushed. When at operating temperature, the lower hose is cool to the touch and the right hand side of the radiator is pretty cool. My question is: how hard is it to replace the radiator yourself? Should I consider a rebuilt? Anyone have any experience with this?