Temp gage
Le Mans Master
Joined: Jan 2006
Posts: 6,800
Likes: 2,653
From: Down south in Dixie
At times it takes quite awhile for mine to catch up with the outside temp. I'm sure you've tried a long drive, so maybe you could unhook the positive battery connection for a little bit. Maybe it will reset. Wish I could help more. Good luck.
Le Mans Master
Joined: Jan 2006
Posts: 6,800
Likes: 2,653
From: Down south in Dixie
OP, do a search in this section for thread heading "Outside air temp stuck". Everything you need to know is there.
Safety Car
Joined: Jul 2009
Posts: 3,755
Likes: 190
From: Baton Rouge LA
St. Jude Donor '14, '16
Try pressing both defrosters and the fan up buttons simultaneously (three buttons at the same time). This makes the sensors update the climate control module immediately. Worth a shot before digging into anything.
Safety Car
Joined: Jan 2001
Posts: 4,387
Likes: 691
From: Boise ID
Race Director
Joined: Apr 2007
Posts: 16,025
Likes: 1,656
From: Toronto, Canada
C7 of the Year - Unmodified Finalist 2021
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Le Mans Master
Joined: Feb 2007
Posts: 8,514
Likes: 235
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
The sensor is very near a potentially hot radiator. Therefor the software refuses to increase the temperature reading if the car has not been moving for a while. It will decrease the temp quickly when you pull out of a heated garage since it knows that is a real change but increases might just be from the radiator if the car is not moving fresh air across the sensor. If you are just admiring the car sitting still the temperature reading might not be right. DRIVE IT! 
