Gmt604 wrote when you reconnected the battery and started it it would have run through the self calibration but you can try it again ignition off pull the hvac ecas fuse for 10 seconds reinstall and start vehicle without touching any controls wait 40 seconds for the control module to self calibrate.
Gmc ac unit reset.
Same car same problem.
Press mode front and rear buttons together to reset tempreture.
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You probably need to replace the sensor gm part number 15047946 it is in the front grill email me for a picture.
Gmc vehicles equipped with an automatic climate control system can measure things like outside air temperature solar load interior humidity if equipped and your vehicle s speed and direction.
Using this information the system automatically works to keep your vehicle s interior at your preferred temperature no matter what the weather.
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