Hello, this is Ted.
I b-leive you have a blown Head Gasket. Engine combustion is pushing coolant back through. A quick verification is this : Make sure overflow cap on, take off the Radiater cap. Disable engine from starting, turn engine over & see if coolant shoots up out of Radiater. If it does, that confirms Head Gasket. Sometimes, you have to run car w/cap off for a few minuetes then see if it shoots out, do that secound. Pull plugs & check for wetness. Check engine compression if needed.
Good Luck.
Ted
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Thursday, January 28th, 2021 AT 9:36 AM