Well shyt... Sounds like the heater core might be leaking on ya. Most cases of a leaking heater core describe a puddle in the passenger area, not so much driver side. But liquid can go anywhere, so it could still be the heater core. A little harder to get to though... Not sure about the process in the 04+ GP's. In the 97-03 you have to take apart almost the entire damn interior.
Remove your radiator cap. Is the coolant all the way up the neck of the radiator? If it's low, could be coolant leaking from the core. Top it off and keep an eye on it. If the radiator is 100% full, and your still getting puddles... I don't know manhh.
