To ensure reliability, purchase GM part # 20921720 Control Assembly, Heater & A/C (W/ Front Seat Heater. It is sometimes referred to as GMC A/C Switch, GMC Blower Control Switches. 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. This part fits specific GMC Yukon models.
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