another coolant leak thread

[Box4two]

just realized after a good drive there is a very small puddle of coolant near the rear passenger wheel, looks like it might have come from what looks like an overflow tube......my cap has never been updated ( its a 2000)....is there a chance this may be the culprit before i start thinking of possible cracked tank?

i did a search but could differentiate the trouble shooting between a bad cap and a cracked tank.