Hey all, I just bought a '95 Millenia, and I just wanted to know everything I can learn about them. Where can I find the answers to these questions?

-What size motors came in these?
-What are the factory hp and tq specs?
-Where can I find aftermarket parts for my car?
-Are there any common problems with these cars?

And lastly, I know this car has/had a cooling system problem where it would overheat after about 5-10 minutes of driving. I drove it today, and it was fine, just got up to temp and stayed. The owner now claims that the fins on the impeller of the water pump are broken, but I know he can't know for sure, because he's never actually opened it up and looked. The car has sat for several months now, and works just fine. What kind of problem would cause this? Is it possible that some coolant passages were clogged and became opened up after starting it today?