As the title says my 65 mustang with the 200 ci 6 is running a little hot. Not so hot as to be hard on the engine, but hotter than it was, and should. I just checked the water temp in the radiator after a loing run, and it is 194 degrees. Not hot you say. But I have a 160 thermostat in it, and the radiator was just back from the radiator shop and rodded out. SO, the radiator is good, the thermostat is new, the temp gauge is ok, and the water pump seems to be circulating the water fine. My thought is to use vinegar or a commercial cooling system flush. Anything else I can do that doesn't involve major engine teardown. PS, I have had this car for 12 years, and it starts, runs, drives fine, good power and gas mileage. Great car, and used to run perfectly cool, and I always kept fresh antifreeze in it. It also has new hoses on the radiator.