I've got a 79 model 504. She's having a few problems with running hot, partly to do with the weather in WA at the moment but partly something else. She's getting to a certain temp and not getting any hotter, but it's a concern. I've replaced the thermostat (put in the right way up), the radiator has been repaired (but still could be dodgy), I've just replaced a leaking fuel pump which seems to have slowed the time it takes for the engine to heat up. The pneumatic fan is working fine, and there doesn't seem to be any symptoms of a bung head gasket. Any suggestions?