AMCC Engine Coolant Thermostat Housing Assembly Compatible with BMW 228i 320i 328i 428i 528i X1 X3 X4 X5 Z4 N20 2.0L engines Replaces: 11538635689 11538648791 11538636594 11537633477 Replacement Coolant Thermostat Housing With Sensor - Regulates the flow of the coolant going through the radiator to keep the engine in its stable operating temperature preventing it from over heating. Therefore, making it a critical component in the vehicle as failure to replace may damage the engine and other critical parts due to overheating which can leave you stranded on the road Reference OE Part Number - 11538648791, 11538635689, 11537633476, 11537588257, 11537633477, 11538636594, 11538636595. Please Carefully check the part number before purchasing to ensure fitment Replacement The Following Vehicle - Fits for BMW 228i 320i 328i 428i 528i X1 X3 X4 X5 Z4 N20 2.0L. Please Carefully check the detail fitment in the product description below High Quality Material - Using reinforced material, it is built to long lasting durability. Meets or exceeds OEM standards. Our item are designed and manufactured according to OEM AMCC products are guaranteed for one year after sale，100% inspection and testing prior to shipment