I have a 1992 Corolla 1.6 4afe engine with over 208,000 miles. Now the car is leaking coolant and its pooling on the driver side, at the bottom of the engine where the transmission and engine join. It continues to leak even if the car is off. I have checked all hoses and clamps, thermostat, water pump, freeze plugs, and the radiator has no leaks. Was thinking it may be the head gasket, but i drained the oil and removed the valve cover and it checks out ok. No smoke from the tail pipe and the car starts up just fine. Is there something I am overlooking? Cracked block, head gasket issue, hidden freeze plug?