The purpose of shielding the water tank in winter is to reduce the heat dissipation of the water tank, increase the temperature of the engine and the small water tank in the car, ensure the safe running temperature of the engine and increase the heating temperature in the car. But there is a thermostat inside the engine to ensure that the engine works 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 thermostat main valve is opened too late, it will lead to overheating of the engine; 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 engine ensures normal heating, and the temperature of the small water tank in the car is the same, which naturally makes the car have heating capacity.
The extended information automobile heating system mainly uses engine coolant as the heat source (most vehicles are using it at present). When the engine coolant temperature is high, the coolant flows through the heat exchanger in the heating system (generally called warm air small water tank), and the air sent by the blower exchanges heat with the engine coolant. After the air is heated, it is sent into the car through various air outlets by the blower.
Generally speaking, the coolant of the water cooling system flows in from the engine block and out from the cylinder head. Most thermostats are installed in the exhaust pipe of the cylinder head. The advantages of this arrangement are simple structure and easy to eliminate bubbles in the water cooling system; Its disadvantage is that the thermostat will oscillate when it works.
The safe life of wax thermostat is generally 50000km, so it is required to replace it regularly according to its safe life. The inspection method of the thermostat is to check the opening temperature, full opening temperature and lift of the main valve of the thermostat with constant temperature heating equipment with adjustable temperature. If one of them does not meet the compliance setting, the thermostat should be replaced. For example, the thermostat of Santana JV engine has a main valve opening temperature of 87℃ 2℃, a full-open temperature of102℃ 3℃ and a full-open lift of >: 7 mm. 。
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