1990 240sx Coolent leak, Only during cold times though :/ Help please.

[Nightslide86]

I have a 90' 240sx, non SE, Auto-Tran. In the morning today i started it up and let it sit for awhile as i was checking on some stuff on the inside. I got out, turned it off and went inside for about 5 mins. I came back and saw the little flow coming from under the car, i checked under it and nothing was leaking. So i turned the car on again and let it idle, after about 2-3 mins it started to drip from under the center of the fan area.

I decided to take the car out for a small drive (Bout a mile), parked with engine on and checked under the car. Nothing at all was dripping and for the rest of the day it was perfectly fine. Then tonight around 8 or so (When it gets cold in this area) when i pulled around from a friends place there was a -small- puddle from where i was parked. Any ideas on what it is and or how i can fix it? thanks.

[NISTECH]

likely the water pump seal is going out. look under the pulley with a small mirror and see if coolant has been coming out of the little weap hole. If so you need a new water pump.