'92 Sentra coolant leak

Hmm.
    My Sentra has lost a little coolant on a regular basis, I believe through a pinhole in the heater core. However, the last time I checked
the coolant, it was down quite a bit (where the reservoir was empty).
    I am also seeing a wet spot under the car near the front passenger side tire.
    I topped off the coolant about two weeks ago, and have only driven 20-40 miles since then, and it's down about two inches in the reservoir again. I can smell coolant when I open the hood.
    It's not quite into "crawl under the car" weather here in Upstate NY, so I haven't done an exhaustive search for the leak. Still, even though the hoses are old (factory), I'm guessing it's the water pump.
    I have not had good luck changing things on the engine on this car. The bolts seem to break (yes, I am careful and used to working on older engines) and I don't fancy changing the water pump. The car is rusted out, has 179K on it, and I have another car anyhow. I'm just getting the "free" miles out of this car as a beater.
    Question:
1. Any obvious other causes for the coolant leak?
2. How hard is it to change the pump (looks like a pain from the manual, made worse by the age of the car)?
3. What is the prognosis if the pump is leaking? Will it just leak for the next 10K mi? or will it get worse rapidly? I have AAA, I have another car I can use for any long trips, can I just live with the leak until the registration runs out in Sept when I plan on ending my relationship with this car. I drive....about 20 miles a week.....maybe.
Thanks for any advice.
PB
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On 3/04/2011 3:02 p.m., Plague Boy wrote:

Run the engine until it's hot/pressurised and check everything closely, or get it checked with the system pressurised. A coolant leak could be anywhere, and you're best to try to find where before randomly replacing parts. I had a problem similar to what you're describing recently, and it turned out to be a tiny pinhole in a hose between the water pump and inlet manifold that probably got pinched when I was doing some other work on the car. It didn't weep at all when cold, but a constant small squirt when the engine was hot.
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