Fit for Toyoa Land Cruiser Prado 2003-2009. part number:16031-31011 Note:If main valve of thermostat is opened too late, it will cause engine to overheat; if main valve is opened too early, engine warm-up time will be prolonged and engine temperature will be too low. Making it a critical component in the vehicle, coolant thermostat housing assembly with stuck or closed shut should be removed for replacement or repair. Function : Thermostat automatically adjusts the amount of water entering radiator according to the temperature of cooling water, changing the circulation range of water to adjust the cooling capacity of cooling system to engine works in a suitable temperature range so that effectively control the emissions engine produces. High-quality materials: Engine coolant thermostat made of high quality plastic material, and long service life, have high level of accuracy and sensitivity, enhance safety of your vehicle. Colour:black Material:plastic Package Contents: 1 x Thermostat