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I had run the overflow hose into a gallon milk jug so I could see beter. I shut it down and went insdie for about an hour? It had sucked the coolant back into the jug.
I don't think I overtightened the cap and yes, it is brand new. The amount of coolant that stays in the overflow jug after it cools down is the same amount it takes to fill the radiator back up. I had the rdiator filled up and then I marked my overflow jug. I have one of those "Louisiana Credit Cards" to siphon (pump) the coolant back into the radiator. I'm praying someone has a simple soulution and it's not a bad head gasket.