I had a slow blinking coolant light turn on after having the overflow tank replaced on my 911. The dealer (non Pcar) had some random shop replace the tank prior to delivering the car. I chased around the coolant level, attempted to purge air, replaced the cap, etc... for well over a week. Brought it to my Indy and the dx was a bad sensor.
The sensor is not part of the replacement tank and I believe the previous shop damaged it while replacing the tank.
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