Mianyang Geely/491Q/4Y Thermostat 34807 Essential Engine Cooling Component

If your vehicle shows slow heating of the coolant, no heat from the heater, or low coolant temperature at high speeds, it is usually a thermostat that has aged and stuck in the open position, causing the coolant to circulate widely and preventing rapid warm-up. When functioning normally, the thermostat automatically adjusts the coolant circulation path according to temperature to quickly bring the engine to the optimal operating temperature, balancing cooling and heat efficiency. Fits Mianyang 491Q/4Y and Geely 479Q engines, OEM number 34807 (Tianbo). During installation, replace the sealing ring with a new one and bleed air from the cooling system to avoid air resistance causing abnormal temperatures.