You have to replace the whole water pump if it's leaking underneath it. The 1995-1998 waterpumps are bad. The impeller shatters and it causes it to overheat. You should replace it asap before it starts to overheat.
Irfan Rahim
irfman2000@yahoo.com
2006 Blue Nissan Sentra SE-R Spec V
Former owner of a silver 2000 Contour SE Sport ATX