Join Date: Oct 2017
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theres about 5 computers involved in the decisions in the car when you turn the temp knob and request a temperature change. there are myriad modules, switches, sensors, connectors, wiring and refrigerant involved in this cars, and all of the actuators involved are a HUGE pita to replace compared to the 8th gen cars. Theres no real homebrew diagnostics that are easy and accurate enough to justify a repair unless you can find a leak....there a dye in the AC system that fluoresces under UV light, breakout a black light and check under the hood and see if you can find any yellowy green oily trails....thatll be a refrigerant leak
Beyond that you need a diagnostic pressure check and vehicle wide DTC check to start proper diag.
What couldnt hurt though is what people call a "global reset" This merely involves turning the car off, and disconnecting the negative battery cable for 5 minutes, and then hooking it back up. this little gem of a trick solves all kinds of software and sensor related anomalies. Akin to unplugging your PC or pulling battery from a smart phone.
GM World Class Technician
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