I cleaned it up a bit. Hard to tell if it was leaking or not. It was covered in old dust. I cleaned up the thermo spring, and put a heat gun to it and the spring worked also was able to move the valve that the spring is attached too.
Turn the fan at room temperature and get a feel for how much resistance there is. Now gently heat it with a heat gun and see if that resistance gets greater. As heat is applied, the fan should get harder and harder to turn separate from the clutch.
