1 The water pump opens the water tank cover and starts the engine, so that the engine runs alternately at high and low speeds. At the same time, check whether there is obvious tumbling phenomenon in the water tank. If there is, it can be considered that the water pump is normal. ?
2 Thermostat Remove the thermostat and check the opening temperature of the thermostat. Hang the thermostat and thermometer in the water container, then heat the container, check the initial opening temperature of the thermostat, continue heating, record the full opening temperature of the thermostat, and check whether these two temperatures are within a reasonable range. Finally, stop heating, and when the water temperature drops below 82℃, check whether the thermostat is in the closed position. Otherwise, the thermostat needs to be repaired or replaced.
3 water tank (including radiator) check whether there is scale on the surface of the water tank, and whether the cooling air duct and the water flow channel inside the water tank are unobstructed. If necessary, please ask a professional to open it for cleaning.
4 Check whether the fan blades are damaged, severely deformed or reversed, and whether there is shimmy. If there is, rule it out immediately. ? 5 Fan Belt Press the fan belt by hand to check whether the tightness is normal. If the belt is loose, it is necessary to further check whether the fan belt slips.
6 Air guide and cooling system Most water-cooled engines use air suction cooling. The air on both sides of the water tank can't produce convection phenomenon, and other parts should be cut off except the radiator air duct of the water tank. It should not be ignored that after many machines are used for a period of time, the barrier materials are seriously aging and falling off, which makes the air ducts around the water tank reduce the air flow through the water tank and cause high temperature. In actual maintenance, this kind of situation is more. ?
7 The engine ratio is too large. Check whether there is excessive scale on the engine casing and waterway, and clean it if there is. I hope my answer can help you. If there is something wrong with the car, ask the car master. 4S shop professional technician, 10 minutes to solve.