Maybe the reservoir has a leak? Replace it. Also the hose from reservoir to radiator.
The reservoir tank holds excess from the radiator and helps keep air out of the coolant. You need to maintain proper level. Yes; add water or coolant.
Add 50/50 water/coolant up to the "hot" or "cold" mark as appropriate.
Hey guys those are good answers, I don't know what I was thinking? It's a shame to get old, like me.
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