I have had my 1999 Corvette for about 2 1/2 years. About three weeks
ago the low coolant display appeared. Sure enough the coolant was low
so I added the correct mixture and took it out for a drive. Before I
put it back in the garage, I put some newspaper on the floor. Parked
the 'Vette and let it set overnight. The next morning, sure enough,
probably a pint of coolant on the newspaper. The next day I took the
'Vette to the local dealer. They ran a pressure test on the system.
They found a pin hole in the coolant tank. The leak is in the front of
the car. The dealer let the car idle for over an hour, parked inside
and they could not find the leak.
I drove the 'Vette last night and I just checked the coolant, yep, low
again and there is a larger quantity on the newspaper.