1. The thermostat is always open or the thermostat is opened too early, causing the cooling system to undergo a large cycle prematurely, while the outside temperature is very low, especially when the car is running, the cold wind quickly kills the antifreeze. With liquid cooling, the engine water temperature will not rise, and the heater air will not heat up.
2. The water pump impeller is damaged or lost, causing insufficient flow through the small warm air water tank and preventing heat from coming up.
3. There is air blockage in the engine cooling system. The air blockage leads to poor circulation of the cooling system, causing high water temperature and low heating of the warm air. If there is always air in the cooling system, it is likely that the cylinder gasket is damaged and air is flowing into the cooling system; if the water inlet pipe of the small heater water tank is very hot and the water outlet pipe is cold, this situation should be that the small heater water tank is blocked. , the small heater water tank should be replaced.
Extended information:
Classification
The car heating system blows cold air to the surface of the heat exchanger, absorbs its heat and guides it into the car, thereby A complete device to increase the temperature inside the car.
1. Water-heated heater system
The heat source comes from the engine coolant. Water-heated heater systems are mostly used in cars, large trucks and buses with low heating requirements. The water heating heating system mainly consists of a heater, a hot water regulating valve, a blower, a control panel, etc.
Among them, the blower consists of an adjustable-speed DC motor and a squirrel-cage fan. Its function is to blow the cold air towards the heater, and then the cold air is heated and sent into the car. By adjusting the speed of the motor, the amount of air supplied to the cabin can be adjusted.
2. Air-heating heater system
The heat source comes from the engine exhaust system. Air-heated heater systems are mostly used in air-cooled engine cars.
Heat exchanger type heating system: During heating, the waste gas valve 4 is turned to the position shown in Figure 2, the hot air in the exhaust pipe is introduced into the heat exchanger 5, and the cold air blown by the blower absorbs the heat exchanger After the heat is released, it is introduced into the car for heating or defrosting.
Heat pipe heating system: The heat pipe heat exchanger is installed vertically in the car floor. The condensation heat release section is above the floor, and the exhaust gas heating section is below the floor. The exhaust gas discharged from the automobile engine exhaust pipe is introduced into the heat pipe exchanger for heat.
The tube exchanger is filled with liquid ammonia. After being heated, the liquid ammonia vaporizes and reaches the upper part of the heat pipe exchanger to exchange heat with the air to heat the air coming in from the vent. After the air is heated, it is blown into the cabin by the blower for heating. After the heat is released, the ammonia gas condenses and flows back to the lower part, and then completes the next working cycle.
Fuel gas heating system: A heating system that uses fuel to directly heat the air is called a fuel gas heating system.
People's Daily Online--Why is it so cold! It’s really terrible if the air conditioner heater is not hot in winter
Baidu Encyclopedia--Car heater system