My 02 Ford F350 7.3 L Powerstroke is starting to build up too much pressure in the radiator. My clutch fan went out and started to overheat the truck while Towing. Now the upper radiator hose blew off and I replaced the host plant thinking that it was just weak. The radiator is still putting out too much pressure. I have not yet replaced the clutch fan or the thermostat. I was told that it could be the injector cups and I wanted more opinions before I started throwing money at it.