KC, take a look at these 2 more closely. If you have a telescopic mirror (mechanics mirror), take the center panel behind the throttle body off before heading out for a long drive. Preferably while the engine is still running, use the mirror and a really bright flashlight, check for any wetness or slow drips. I have also seen expansion tanks with hairline cracks leak on the underside where you don’t normally see them and because the heat accumulates directly under the hood with the engine off,