To ensure reliability, purchase GM part # 12639905 Housing Assembly, Engine Coolant Thermostat. It is sometimes referred to as GM Thermostat, GM Thermostat Housing. 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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