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When starting my '11 base Cayman in 17F dry weather yesterday morning, the temp gage moved to far right about 20s after startup. I drove about 100 yards expecting it to drop. When it didn't I pulled over and turned the engine off, waiting about 10s before restarting. After about 20s it did it again. I knew it was a gage/sensor fault so I kept on driving to let the car warm up. After about 5 minutes it dropped down to where it should be at that stage of warmup.

Car's a California car which normally doesn't see sub-freeIng weather. This happened while visiting my Dad in Nevada high desert, and was parked outside for about 36 hours through 2 nights. Any thoughts on what it was?
 

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When starting my '11 base Cayman in 17F dry weather yesterday morning, the temp gage moved to far right about 20s after startup. I drove about 100 yards expecting it to drop. When it didn't I pulled over and turned the engine off, waiting about 10s before restarting. After about 20s it did it again. I knew it was a gage/sensor fault so I kept on driving to let the car warm up. After about 5 minutes it dropped down to where it should be at that stage of warmup.

Car's a California car which normally doesn't see sub-freeIng weather. This happened while visiting my Dad in Nevada high desert, and was parked outside for about 36 hours through 2 nights. Any thoughts on what it was?
Well, one & it's not a comforting one. Get the level of freeze protection checked. I know of one instance of a car coming from Florida to the Rockies, and the owner fortunately discovering early that what might be considered adequate anti-freeze protection on Florida, was way short of adequate for what cold temperatures might be encountered in the Rocky Mountains in winter.


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You'll want to make sure the coolant level is full too.
 
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