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My guess is your car is running a bit hot and blowing off some pressure. If you take both caps off and remove the plastic cover, you will find the pressure relief valve underneath. It has two o-rings that can go bad, the relief valve can go bad and you might need the updated coolant cap. The latest part number rev ends in -04. When your system purges, it dumps coolant under the cover that drains out through a hole in that dished area.
While you are in the trunk, try pulling up the carpet and check to see if you have any coolant underneath. Your coolant tank may have developed a leak.
Make sure you let the system cool down before trying to take the coolant cap off.
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