ALL antifreeze leaks will be seen coming from the bottom of the car. Yes, it COULD becoming from the water pump. But then again, it could be coming from an intake manifold gasket, a heater hose, a throttle-body heater hose, a freeze plug, a timing cover, a heater control valve, etc..
To find out where it is leaking from, you must follow the antifreeze trail UP from where you see it leaking. Antifreeze leaks ALLWAYS travel downhill. Sometimes they can be deceiving also. I have seen intake manifold leaks at the front of the engine run all the way to the back of the engine and make it look like a rear freeze plug is leaking. Again, you must follow the trail to find the actual source.
SOURCE: 1999 kia sephia leaking antifreeze
I have a 97 Sephia with what sounds like the same configuration. The tube is for the heater and there is an "O" ring on the metal tube that goes bad over time. You can replace the gasket by removing the metal tube from the engine, or the water neck and replace the o ring.
SOURCE: antifreeze wont stay in car leaking for bottom
You need to look closely at the hose connections, freeze plugs, and the water pump. Water pumps are designed so that when the shaft bearing wears out, they leak from a small hole under the pulley shaft. Sometimes they will only leak while the engine is running. Freeze plugs can rust through causing a leak usually from the side of the engine. Hoses can leak from anywhere. You'll probably have to get under the engine to narrow down the possibilities. You may also want to rent a tool to pressurize the cooling system. That might help you to see where the leak is coming from. If you've never changed a water pump or a freeze plug before, you might be better off taking it to a professional. If it's just a hose, you could probably do that yourself. I hope this was helpful. Thanks.
SOURCE: pour antifreeze and it some leaks out the bottom of car
Probably a gash in under the radiator; drain-plug not tight or bad; hoses leaking.
SOURCE: Replaced water pump, alternator, radiator, crank
Inside the coolant reserve tank there is a sensor for coolant level.
Over time,this sensor can get stick.
Inspect the coolant reserve tank for crack or leak.
Locate the coolant level switch/sensor and soak it in clean warm water.
Make sure it's free to move up and down the float path.
Top off the coolant tank with coolant only.
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