Cooling problem SOLVED

I too in 1973 had that happen. The car was a friends mother's 66 Valiant 170 3 on the tree. She bought it new. Six years later when no one could keep it from overheating parked it and bought a new 72 Scamp. She sold me the car for $16, all the money I had in my pocket. It took awhile but finally found the problem like you, propeller spinning loose on the shaft. You are the only one that I have heard that happen to in 41 years.A real mind bender, New parts ? They can't be bad......:toothy7: