1, cooling system circulation problem
The heat of automobile heater comes from engine coolant. When the heater is turned on, the coolant flows through the heating box under the center console, bringing heat. If the cooling liquid is not circulated, the high-temperature cooling liquid cannot be sent to the warm air tank, and naturally there is no warm air.
The main reasons why the coolant does not circulate are pump failure, air in the cooling system and insufficient coolant. If there is a problem with the coolant circulation, not only will there be no warm air, but the engine temperature will also be very high. As long as the circulation problem is solved, the warm air will naturally heat up.
2, warm air water valve failure
The warm water valve is located on the inlet pipe of the warm water tank. You can find it along the cooling system pipeline after opening the engine compartment.
The function of the warm air water valve is to cut off the coolant circulation of the warm air water tank when the warm air is not used, which can reduce the workload of the water pump and unnecessary heat loss. Moreover, the warm air tank is next to the evaporator of the air conditioner, and cutting off the refrigerant supply of the warm air tank when the air conditioner is turned on can improve the refrigeration effect of the air conditioner.
If the heater water valve is damaged, the coolant may not enter the heater water tank, resulting in the heater not being hot.
Extended data:
The heat medium used in the heater can be water or steam.
The advantages of heater heating are:
(1) The heat supply of a single machine is large, and the number of terminal equipment used under the same heat load is small;
(2) The small heater can be hung, which does not occupy the building area, and the large heater is installed on the floor, which occupies a limited area;
(3) The starting temperature rises rapidly.
The disadvantages of heater heating are:
(1) When the heater is running, the fan makes noise. Generally, the noise of small heaters is about 60dB(A), and the noise of large heaters is even greater.
(2) The heater is placed in the heating room to directly heat the indoor circulating air, and the indoor air quality cannot be improved without supplementing fresh air (outdoor air).
In view of the advantages and disadvantages of heater heating, the heater heating system is suitable for the following situations:
(1) A factory or site with large space and heavy heating load, which allows indoor air to be recycled;
(2) factories, workshops, venues and other places that need to quickly raise the room temperature;
(3) Some non-three-shift workshops provide intermittent heating.
The heater heating system is not suitable for the following situations:
(1) Places where air cannot be recycled, such as factories with toxic substances harmful to human body; The process of producing flammable and explosive gases, fibers or dust.
(2) rooms with strict requirements on environmental noise.
References:
Baidu encyclopedia-heater