i have a 95 civic w/b16 swapped in about a week ago. There is a HUGE puddle of coolant under the driverside floormat. Also coolant is leaking from under the engine bay, by where the heater hose from the thermostat goes into the firewall (to the heater core i think). There is no coolant anywhere else in the car other than the under the driverside floormat. I just replaced the thermoswitch today but there is not coolant leaking from there.