I've had a coolant leak problem with my '90 Miata ever since I bought it. First it was something with the heater core, and it stopped leaking for a while after a hose was replaced. Then, it was the upper radiator hose. Next, it was the radiator. After I got the radiator replaced, I was tired of fixing the coolant system and I've been adding coolant whenever the reservoir got low. I kind of forgot about it for a month (since school started) and I had to add about a gallon of coolant the other day. Well, it was about half a gallon of water and half a gallon of (50/50 premix)coolant.
A few days later, the charge idiot light came on one day after I started my car. I drove it for about a block and it went off. I looked in the manual and it said that the charge light would come on if there's something wrong with the alternator, battery, or the belt that runs the alternator and the water pump. My car's been making belt noises for a while now, too. Pretty much every time I start my car, the charge light comes on for about a block or two before going off.
How serious is this? I drove about 1000 miles in the last six months and might drive another 2000 miles in next eight months, before I buy a new car. I don't want to spend any more money than I need to on this car.