Bad thermal fan clutch
Hey RedFish...thanks...however fan works properly and is mounted the same since new. I have since replaced the 195F thermostat with a 180F and drilled it, also changed the pressure cap 16 lbs. with a 13lb. lift type pressure cap.
Amazing but it hasn't heated up once since then. Keeping my fingers crossed...
A crack in an exhaust valve seat is a good clue, however all symptoms of overheating due to a crack have disappeared. There are no bubbles in the water on start or after heating up. I would think a crack would manifest symptoms other than overheating? No exhaust crackling or intake back fires.
However, I am told that a crack in a head (somewhere) is in all likelihood the culprit. I am carefully optimistic at this point as everything has worked well for over a week.
