[Hodo]

Ok the belt does sound like its loose. When was the last time it was changed, if it has been more than 60K miles change it. Along with the timing belt and all the other belts while your there. As for your coolant problem it could be any number of things. The most common of which at that age is a cracked hose, check for signs of coolant leaking fron the lower and upper hoses to the radiator, they could be REALLY small so look for this white crusty build up around the connection points on the hoses. Also if you have access to a pressure tester you could pressurize your coolant system to about 30PSI and look for leaks, by watching the gauge if it drops more than 5PSI in 15min then you have a leak somewhere. Then it would be kinda easy to find becuase it would be dribbling out of the place its leaking.

Hope that helps a bit.