To ensure reliability, purchase GM part # 1999499 Auxiliary Heater & Air Conditioner Blower Control Switch Assembly. It is sometimes referred to as Chevrolet A/C Switch, Chevrolet 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 Chevrolet Trailblazer models.
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