First, list the engine size and mileage. I don't know which side the reservoir is on so you're going to have to tell me that. Next, you or someone else is going to have to look for the source of the leak. The good news is while the overheating could have resulted in a leaking cylinder head gasket, it sounds like you caught it soon enough and you only have to worry about a much less serious external leak.
Has the coolant ever been changed? Knowing the mileage will help with forming a generalization as to how much acid may have built up in it. That will lead to corroded heater cores and radiators. If the heater core is leaking, you'll find the coolant leaking from a 4" long rubber hose with a 90 degree bend hanging down from the passenger side of the firewall under the hood. The puddle will form just to the left of the right front tire.
Friday, July 3rd, 2015 AT 8:02 PM