my air condition outside air temp is not reading correct on 2002 Chevrolet Trailblazer

I live in Florida and the possible ice warning was displayed and the outside temp read 5 degrees. after a few min the temp went up to the 89 degrees. after a few min it dropped to 60 then back to 83.Is there a sencer acting up. A few weeks ago the battery went dead dead. I put in a new one and little things have been happening like tis. Is it major or a miner repair.

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1 answer 2 comments
the mirror ? The reading show up onn the AC screen.Is there a sensor in the grill.
o sorry bout that i thought you ment deg in mirror. you controler may be going bad they should be able to get codes from a/c to help determine issues