Q: Is my water pump the culprit?

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Coolant seems to be escaping the system somehow. After every drive, the coolant reservoir is nearly empty and the radiator is no longer topped up... where is the coolant going or leaking from? The heat isn't working efficiently (heating, but lightly). After a recent fix, the mechanic mentioned that my water pump was going. Not sure what the indicator was, but maybe this is it, finally...?

My car has 210000 miles.
My car has an automatic transmission.

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