I have a Camaro Berlinetta. I just notice my passenger and rear floorboards are wet when I left up the mats. Mats are dry on top but wet underneath. Sides are dry. I don’t smell any coolant. The car sits on level ground. What could cause the leaking?
Still could be heater core leaking. Check the coolant level periodically to determine if you are loosing any coolant. The seals around the door may be leaking. Spray with water hose and see if any gets in.
Another thought may be the evaporator core drain plug is clogged.