To ensure reliability, purchase GM part # 84278912 Heater & Air Conditioner Control Assembly Remote*My19 Yz Version. It is sometimes referred to as GM A/C Switch, GM Blower Control Switches, GM HVAC Control Module. Directly from GM, genuine parts are superb with regards to quality, longevity, and fit. Every single part passed stringent quality testing, so you can be sure that it's safe, durable, and built to perform like your original parts.
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