Could be the radiator if the puddle is near the front of the car. That would be much better than a head gasket. The system can be pressure tested, then you can snoop around to see where the coolant is leaking from. Many auto parts stores borrow or rent tools. It has a hand pump to pump the system up to 15 pounds of pressure, then besides looking for the leak, it has a gauge to show if the pressure is leaking down. That can be misleading too because very often the tester itself leaks where it is connected to the radiator cap.
Also, don't over look that sometimes hose clamps work loose. If you see green juice on the end of one of the hoses, the clamp might just need to be tightened.
Wednesday, April 13th, 2011 AT 5:00 AM