I've had my 91 NSX (59k miles - stock) for about 1.5 months now. I noticed a few days ago that it started to leave a small puddle of coolant overnight in the front driver's side, about a 4" diameter. When I finally jacked it up and got underneath it everything was dry, including both drain plugs, but that small bleeder valve at the bottom of the radiator directly below the drain plug was ever so slightly dripping coolant. I went ahead and put a vacuum plug on the port and it seems to have stopped it. Anyone else have this issue? What exactly does it mean?

