The water pump is located in the time belt compartment. It would be best not to attempt this yourself unless your an experience mechanic. If your going to have the water pump replace you should go ahead and have the timing belt and front seals replaced while they are in there. Its a major pain to do this yourself, and a good shop will charge anywhere from $700-$900 to do everything I mentioned.
I got my galant used because of the water pump I am a mechanic and will not replace it again 97 2.4l engine needs to go to a shop for a water pump at any cost
............. I would add this
I did it in my drive way in 5 hours and 200 in parts.. the trick is divide and conquer. In order do this,,,
the Power Steering pump
the engine mount... prop up the engine with jack or wood blocks
the timing belt cover top
the water pump pulley
the crank pulleys
the lower tining belt cover
you will now see the belt and the water pump easily and if your have gotten this far the rest is self explanatory
only make sure you lock down the came pulley so you don't throW off your timing when putting back on the belt
the belt tension must be loosened to allow the belt to come off
get a repair book for this part..
a bit of work but I saved $1200 from the local shop price for all
the... BACK yARD Hack
It is a pretty good job. Get a manual fron the parts store.
Assuming you have the 2.5 engine, the water pump is driven off the timing belt.
Most likely located in fuel tank
The water pump is located in the shroud that houses the timing belt. This is why the pump is changed when you get a new timing chain.
The fuel pump is in the gas tank
use the remove timing belt instructions and it includes the water pump,"if your in there do them all !"
If the fluid is full, it could be as simple as the thermostat otherwise its the water pump.
In the fuel tank
You did not indicate the year your Galant 3.0L was produced. I looked up a 2001 model Galant LS 3.0L, and yes, it is an interference engine. Replace the timing belt AND water pump every 100,000 miles or kiss the valves goodbye.
under the back seat