|Originally posted by Gall757:|
There should be evidence of fluid loss if you 'maxed' the gauge. Maybe the overflow tank overflowed...or something. You would have air in the system after that, and you are doing all the right things to fix that. It's possible that you have a puncture in a hose, which releases coolant only when everything is hot and under pressure..and leaves no trace.
Maxed gauge was the temp gauge due to the thermostat not opening and letting coolant to the radiator.