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Hmm, maybe MacGeek can chime in soon. You may have to wait and get the car out of the son to cool off. My 348 AC unit would flip to an Error code state in OBD1 visible on the the digital LEDs but the AC still worked. Don't ask about the hidden fuse, haha. Shut the car down, restart when cooled off the next day no worries. It's just stupid computer chips and software. When it locks up, reboot or let it cool off. I think the thermistor or chips are wicked hot and need to cool and shrink.
 

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The outdoor temperature sensor (which sticks out from under the passenger side mirror) is directly connected to the Body Computer module, which then broadcasts the data over CAN. The BCM does monitor the sensor both for short circuit and open circuit (respectively DTC B107B-11 and B107B-13). You could try putting an ice cube directly on the sensor to see whether the temperature changes. It could also be a software glitch.
 
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