Antifreeze leak on 2002 Ford Taurus

When I park my car after driving around for awhile I find a pizza size pool of antifreeze on the passenger side of the car by the front bumper. This doesn't happen all of the time, just occasionally. One morning the windshield of the car fogged up, but that was only once. I took the car to a reputable repair shop and they did complete pressure testing and heater core and could not get the car to leak. I am at a loss to know what to do now.

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2 answers
It may need to be cold to leak like you describe. You may have to leave it there overnight for them to check it cold. But if you get condensation on the inside of the windshield, I think your heater core is leaking at low temperatures because there's a crack somewhere in it which only leaks when cold.
You may have a defective overflow tank.