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Hi. Welcome to chat! My name is ***** ***** have been a dealer tech for 20 years. I will attempt to assist you with your concern today.
When the coolant gets pushed back into the reseviour it could be from a failed radiator cap. Or also it could be from failed head gaskets. A water pump will not do that. With a failed water pump, coolant just sits in the system and does not get circulated. You would have an overheat concern. I would recommend replacing the radiator cap first.
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