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I had something similar happen.. I was sitting at a stop light on my way to court for a ticket.. i saw some white smoke coming out of my taillights, then stopped the car, got out and saw my car dropped almost all of the coolant.. i was able to drive it down the block to a gas station before the engine overheated.
I had the car towed to the Highland Park Porsche Dealership on the Northside of Chicago.
The car was diagnosed with a broken "Trans-coolant Valve" A $50 part that regulates the flow of engine coolant into and out of the engine.
They replaced the part for about $600, then pressure checked the system and my water pump went, which cost me another $1000.
My first bet would be a hose, or similar to mine with a broken valve.
Did your wife see the puddle after the engine was off? It could have broke when the engine was being turned off so you did not see any white smoke/vapor like i did.
Just my experience and .02
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