Laura,
As long as you're talking about cars - that coolant leak on your current GM is most likely the lower intake manifold gasket (we discussed this, but you wanted me to remind you so you could pass it along to your hubby...)
GM has a problem on the V6; the gasket blows at about 60,000 miles.
We are lucky enough to have 2 GM vehicles with this engine (Alero and Aztek.) Chris is outside with his buddy Russel right now replacing his gasket for the SECOND time (watch out for the aftermarket replacement - both Chris and Russ have experienced failure on the replacement part in under 10,000 miles, and are having to do the repair all over again... This includes removing the entire induction portion of the engine, so it's really not a lot of fun...)
You can do an easy check on your car to see if the coolant is leaking into your engine. Remove the "fill oil" cap and look for a milky, white gel type of substance on the inside of the cap. If you have that kind of buildup, then you have a PROBLEM.
Replacement of the gasket is ~$800 - $1000 at a dealership, but that could be the least of your problems if the coolant has been leaking for some time into the engine.
If you were to do a web search for "lower intake manifold gasket" I'm sure you would get a ton of hits from angry GM owners. I think a class-action lawsuit is in the works...
Happy car stuff.
-Tiff