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Suitable. 450 yuan replaced the thermostat manually, but the base said it didn't need to be replaced. I changed it at a special store of General Motors, saying it was the original factory.

The thermostat automatically adjusts the amount of water entering the radiator according to the temperature of cooling water, changing the circulating range of water, thus adjusting the cooling capacity of the cooling system and ensuring the engine to work in a suitable temperature range. The thermostat must be kept in good technical condition, otherwise it will seriously affect the normal work of the engine. If the main valve of the thermostat is opened too late, the engine will overheat.

If the main valve is opened too early, the engine warm-up time will be prolonged and the engine temperature will be too low. The function of thermostat is to prevent the engine from supercooling. For example, after the engine works normally, if there is no thermostat when driving in winter, the engine temperature may be too low. At this time, the engine needs to temporarily stop water without circulation to ensure that the engine temperature will not be too low.

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The main thermostat used is paraffin thermostat. When the cooling temperature is lower than the specified value, the fine paraffin in the thermostat temperature sensor is solid, the thermostat valve closes the passage between the engine and the radiator under the action of the spring, and the cooling liquid returns to the engine through the water pump and circulates in the engine. When the temperature of coolant reaches the specified value, paraffin wax begins to melt and gradually becomes liquid.

The volume increases, which compresses the rubber tube to contract. When the rubber tube contracts, it generates upward thrust on the push rod, and the push rod generates downward reverse thrust on the valve to open the valve. At this time, the coolant returns to the engine through the radiator and thermostat valve, and then returns to the engine through the water pump for large circulation. Thermostats are mostly arranged in the water outlet pipe of the cylinder head, which is simple in structure and easy to eliminate bubbles in the cooling system; The disadvantage is that the thermostat is often switched on and off when it works, resulting in oscillation.