ALH losing radiator fluid

I'm losing radiator fluid slowly on my wagon. The radiator fluid and my engine oil look fine. I am noticing some radiator fluid on the coolant flange on the driver's side of the head. The fluid is pooling in the valley on the top of the coolant flange. Should I just replace the coolant flange or could the leak be coming from somewhere else?

Is it the plastic flange, or the aluminum one? If it's plastic I'd change the whole flange, as the plastic gets old and warps/fractures.

It is plastic because my car used to have an auto in it. Ok, I will trying a new flange.

I replaced the coolant flange and coolant temp sensor. The leak is gone.

Glad you got it fixed & posted the cure.
It may help others down the road.