To ensure reliability, purchase GM part # 55578957 Seal,Engine Coolant Thermostat Housing. It is sometimes referred to as GM Thermostat Gasket. 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 Aveo, Cruze, Sonic models. It fits Pontiac G3. It also fits Saturn Astra.
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