To ensure reliability, purchase GM part # 12559337 Thermostat. It is sometimes referred to as GM Thermostat. 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 G10, G20, P30 models. It fits GMC G2500, G3500.
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