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Is it leaking from the side by the coolant reservoir?
Bad heater core?
To put oil in a gear box of a Chrysler PT Cruiser, first plug minor coolant leaks.
How To Find & Fix Coolant Leaks http://www.aa1car.com/library/coolant_leaks.htm
Probably the thermostat is sticking.
It is on the right side in front of the air box...
Coolent leaks from pasenger side of engine.
How To Find & Fix Coolant Leaks http://www.aa1car.com/library/coolant_leaks.htm
Under the hood on the opposite side of the coolant.
If it is just water and not coolant, then suspect a leaking windshield, or possibly a A/C condenser drain line stopped up. If it is coolant, then the heater core is leaking and needs replacing.
The coolant leaks out.
It leaks coolant.