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Yes, because water pumps have what is known as a 'weep hole', which will leak coolant when the water pump is going bad. Look for water or moisture in the area of the pump, especially when the engine has reached operating temperature, and then has been shut down. This is the time of the highest pressure in the cooling systen, when the coolant is still absorbing heat, but is not being circulated.

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Q: Could a bad water pump keep anti-freeze from getting back into the overflow tank?
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