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You might also replace the reservoir cap, when you stop the car, the temperature and pressure will spike, because the coolant is no longer circulating. If the cap is marginal it might let a bit of coolant out. My cap (only three years old!) started doing that recently, so I replaced it an it appears to have solved the problem. My cap was an actual Porsche part that was the latest part number, but it still was starting to fail.
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