Where abouts was the most recent "puddle" located under the car?...Front, rear, middle, left or right?
(Front left or right could be a problem with a radiator or connection)
(Middle left or right could be connections, hoses, thermostat and water pump)
(Rear (behind the rear wheels) left or right could be expansion tank or the hoses there)
BTW....I don't think that running the car on a jack for a few minutes is the best way to get the system up to temp.....driving is best then pull over in a level parking lot or your garage and observe until the system gets cooler.
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98' Boxster
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