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This just happened to me yesterday as well. Gauge read 180 but the light flashed. Pulled over, shut it down, and quickly searched 986forum for 'flashing temp light' on the iPhone. Found that it is most likely a low coolant level or faulty temp sensor. My level was ok but I had just picked it up from the collision shop and they replaced the center radiator so I attributed it to a possible air bubble in the system. I pulled up the bleed valve and drove home 380 miles keeping a close eye on temps and the light never came on again so I ruled out a faulty sensor. After I got home, closed the valve. No issues today and coolant level is within limits.
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