I can't visually see where I'm leaking coolant, but it shows up right at the base of the firewall. Heater core???? None of the hoses shows any wetness on them. Had the front end up on jacks today, and after the engine got to operating temp I loosened the cap on the expansion tank 1/2 turn, coolant poured out of the spot I couldn't see at the firewall. The reason I wasn't noticing fluid on the ground before was that it was being caught by the belly pan. Would never have known that without jacking it up. Thanks for the insights.