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Running low on coolant could make that difference, although 225 isnt that unusual for these cars. Perhaps you have a leak somewhere. I'd be searching for coolant drips under the car. The waterpump is a common part that eventually fails and leaks. The coolant reservoir is another. Keep an eye on the level too to see if it starts going down again. You really should use the right mixture of Porsche coolant and distilled water in the 997 too. It's supposed to be lifetime coolant.
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