clean fresh fluid, it looks nice and clean,
then drive,
does it push garbage in to the overflow tank and then when you look down the filler neck you see signs of oil, carbon and junk floating in the liquid. (not pure and green)
the head gasket is bad.
there is a proper test that can discover this, a pressure leak down and a contamination tester can both find this .
baring that , just careful observation of the quality of fresh antifreeze and water will tell the truth.
also pull a full compression tests on each cylinder can help.
substitute , pink, orange or whatever you are running if not green.
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