I keep finding a small puddle of coolant sitting on a lip about 1/3 of the way down the engine. About 4 months ago it kept overheating so I changed the thermostat, fixed. But it still leaked coolant slowly. Now the car is overheating again and the heat doesn't work most of the time. It also is going through a crazy amount of anti-freeze, and it is blowing out the overflow hose on the reservoir. About to take it to a dealer or mechanic, I don't have a garage and it is -4 outside. Can anyone help??