Engine coolant thermostat housing assembly designed to control coolant flow through the radiator to help the engine reach and maintain normal operating temperature.Contains a temperature-sensitive valve that opens at a specified temperature to allow coolant circulation between engine and radiator. Fits: Rendezvous 3.6L (2004–2006), LaCrosse 3.6L (2005–2008). Part Number: 12597257. Dimensions: 19.5 x 6.8 x 9.1 cm (7.68 x 2.68 x 3.58 inches) L×W×H. Thread Hole Size: 5.3 mm (0.21 inch) diameter. Thread Size: M6×1.0. Material: Metal. Color: Silver. Package Includes: 1 × Thermostat housing assembly. Note: Color appearance may vary slightly due to and screen settings.Dimensional tolerance: ±1–3 cm.