My car dumped its coolant yesterday, on a hot day!. I shut the car off, poured in a gallon of coolant into the reserve tank, and it immediately poured out somewhere at the back of the engine on the passenger side. I let it cool overnight, and I didn't start it in the morning but poured water into the reserve tank again. And it poured out again. It's difficult to see back there, I could see the top of the starter is wet as well as the cable leading up from the starter. The cat is wet, but I can't see where the water originates. The car wasn't running so it wasn't circulating through the engine block. any ideas how I could determine where it's coming from?