11531437040 Car Engine Cooling Thermostat Housing Coolant Water Pump Outlet For E46 E39 X3 X5 Z3 Z4 320i 325i 330i 525i 530i This thermostat housing is designed to connect the coolant water pump outlet to the engine cooling system.It directs the flow of coolant between the engine and radiator to help regulate operating temperature.The component is engineered for compatibility with specified vehicle models and integrates into the existing cooling assembly.It serves as a housing for the thermostat, proper sealing and alignment within the cooling.Installation requires standard mechanical tools and follows typical procedures for coolant system components.