2. Check the operation of each gear of the blower to ensure that each gear has sufficient speed. If the knob is set to the warm air position, the air volume is large enough and the wind direction is normal, and the cold air is blown out, check whether the cable of the hot and cold air control flap in the warm air box falls off, whether the warm air impeller is damaged, whether the flap falls off, etc. After troubleshooting, the warm air will get hot.
Extended data:
Common heating systems in automobiles can be divided into three types: coolant heating, gas heating and tail gas heating. Coolant heating is used in automobiles. It consists of cooling liquid, water pump, water valve, blower, warm air water tank (heater core) and other components.
The coolant is heated by the engine. After the heated water is pressurized by the water pump, it enters the warm air water tank from the water inlet of the warm air water pipe through the rotary water valve that controls the coolant flow. The coolant entering the warm air water tank enters the engine from the water outlet of the warm air water pipe, and so on.
When the heater box (heater core) is heated by the coolant, the blower is also working. The blower sucks the cold air inside or outside the car, and then blows it to the heater tank. After being heated by the warm air tank, the cold air is blown into the car, thus increasing the temperature inside the car.
Under the normal working condition of air conditioner, the water inlet pipe and water outlet pipe are hot due to circulation. If it is cold, it means that the warm air tank has been blocked, and the cooling liquid cannot circulate effectively, which leads to the phenomenon that the cold air blown by the blower is not heated by the warm air tank, which leads to the warm air not being hot.
Phoenix Net-Is the car air conditioner heater broken in winter? It turns out that they are the culprit.
Baidu encyclopedia-automobile air conditioning
Baidu encyclopedia-automobile heating system