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Have you done a block test on the cooling system? This is a test the checks for engine combustion gases in the cooling system which can be caused by a blown head gasket.
Any auto parts store will sell this kit. You check it at the coolant degas bottle with the engine running.
This is the best way to check for a blown head gasket. If it is really bad, you will get coolant mixing with the oil and turning the oil into a milky substance that looks like really light chocolate milk on the oil dipstick.