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Usually when the sensor goes bad it will constatly read something like 55* or 65* without changing.
What are your symptoms? No display at all ? or wrong temp? etc...
If your outside temperature is incorrect, you need to replace the sensor (about $10-$15) at your local Chevy parts store. Below shows where it is located:
If your HVAC display went out, then corvettezman (and Toque...) has got you covered.