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could be the water pump but I would be looking for a larger leak, like a radiator hose, radiator tank split
most water pumps leak a slow dribble and then mostly when running
have a pressure test done on the cooling system to find the exact location of the leak
have your thermostat checked or remove it yourself car can run without it if it improves replace it with a new one these do sometimes get stuck ,if you do replace it always add antifreez to your water this also helps to keep your water and water jackets clean.
If the gauge shows hot within the first 30 seconds of starting your car in the morning, you probably have an electrical short in your temperature sensor. This may be located on the engine block or on the radiator. If you can locate it, you might try to disconnect the electrical connector to it and see if the gauge stops indicating hot. If so, you might just buy and install a new temperature gauge sensor (you will need to drain the antifreeze from the radiator (and later replace/reuse it) using the finger-turned draincock at the bottom of the radiator, and should only do this when the engine is actually cold - check the temperature of the radiator cap and squeeze the radiator hoses to see that they are not pressurized, then if cold, remove the radiator cap, place a container below the drain and open the drain). Use teflon tape to wrap the threads of the sensor (in the opposite direction you would screw it in) before installing. Be aware that radiator fluid is toxic if injested by pets or people.
Let's don't say that it is the head gasket yet. There is a heater core that could be bad. First, replace the t'stat. When putting water/ antifreeze back into the car. Add the water to the outgoing hose of the radiator that feeds into the engine. This will insure you get water into the engine. Of course you will still add water to the radiator itself. Let the engine run while you are adding water. It won't overheat while you are doing this. If you do have a blown headgasket, you will have water in your oil. Does the gauge go to the red at low RPMs only? Lt me know what you find out.