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Q: Anti-freezeleak on 1994 Chevrolet Corsica

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I have noticed an antifreeze leak when my car gets hot and than I shut it off(or that is what it seems like) Checked the top and bottom hose but all looks fine. Is there something I am missing?
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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The way an automotive shop would locate the leak is by removing the radiator car and attaching an adapter that screws on in place of the radiator cap. Something that looks like a bicycle pump with a pressure gauge attached to it is used to "pump up" pressure to simulate pressure generated when the cooling system is at operating temperature, the leak is then found sometimes it is obviously leaking from a coolant hose or cracked housing, failed gasket or water pump, sometimes the engines cooling system needs to be inspected from below or inspected using a mirror and flash light.
So I have the same problem I turn the car on and it starts to leak. I had my wife turn the car on while I was under it and saw the leak coming from a hole in the bottom of the water pump. Looks like a plug or small screw the is missing. What could it be?
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