To ensure reliability, purchase GM part # 12559807 Thermostat,Engine Coolant. 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 Buick Lucerne models. It fits Cadillac Allante, DTS, Deville. It also fits Oldsmobile Aurora. This also fits Pontiac Bonneville.
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