I have an 02 with 65,000 miles and have noticed a small coolant leak myself. I have yet to see a puddle or anything under the truck, i think it only leaks when its running and heated up, but then again I dont know much about the whole radiator/coolant thing since I'm a newb. Right now, it takes about a month or two to go from the full level down to the low level. Do you guys think its anything to worry about? Or should I just keep filling it up until it really starts to leak on me?