Pacific Automotive Network replaces the thermostat. There are also special cases in troubleshooting. The thermostat is not damaged but the air conditioner has a short shutdown time or does not shut down. Because the temperature sensing package is suspended in the middle of the evaporator with a U-shaped plastic shelf, it is about 2mm away from the fins. It is estimated that the manufacturer's design is intended to cause the temperature sensor package of the thermostat to act as a temperature delay to prevent the air conditioner from starting frequently in a short period of time (within 3 minutes).
The temperature control failure of the mechanical thermostat temperature sensing package gas pressure changes with the temperature change, driving the thermostat contact action. Due to reasons such as contact adhesion and insufficient spring elasticity, the contacts are normally closed and the air conditioner is turned on continuously, causing ice to form. There are also special cases when replacing the thermostat and troubleshooting. The thermostat is not damaged but the air conditioner has a short shutdown time or does not shut down. Because the temperature sensing package is suspended in the middle of the evaporator with a U-shaped plastic shelf, it is about 2mm away from the fins. It is estimated that the manufacturer's design is intended to cause the temperature sensor package of the thermostat to act as a temperature delay to prevent the air conditioner from starting frequently in a short period of time (within 3 minutes). In the midsummer season, the indoor temperature is high, and due to the limitations of the air conditioner itself in cooling, it is difficult for the thermostat to reach the temperature control breakpoint. The air conditioner is shut down for a short time, or even turned on continuously, causing freezing. This type of ice often forms in the lower part of the evaporator. In this case, the temperature sensing package must be moved to the lower end of the evaporator and fixed close to the evaporator fins, and the fault will be eliminated.
If there is ice in the air conditioning system, it may be that the air conditioner drain hole is blocked, the water content of the air conditioner refrigerant is too high, or the temperature sensor is faulty. Car enthusiasts need to find professionals to detect the cause of the fault and then replace the faulty parts.
The car's air conditioner is a very important comfort feature in the car. The air conditioner can cool and heat.
I think the refrigeration principle of the car air conditioner is very simple. When the car air conditioner is cooling, you need to press the ac button, and then the compressor clutch will be combined. At this time, the engine will drive the compressor to rotate.
As the compressor rotates, it continuously compresses the refrigerant and delivers the refrigerant to the evaporator. The refrigerant expands and absorbs heat in the evaporator box, so that the refrigerant can cool the evaporator box. The cooled evaporator box can cool the wind blown by the blower, so that the air conditioner outlet can blow out cold air.
When the air conditioner is heating and the heater function is turned on, the high-temperature antifreeze in the engine will flow through the heater water tank. At this time, the wind blown by the blower will also pass through the heater water tank, so that the air outlet of the air conditioner Warm air can be blown out.
Most of the refrigerant used in automobile air conditioners is r134a. This refrigerant needs to be replaced regularly, otherwise it will affect the cooling effect and cooling speed of the air conditioner.
When changing the refrigerant, you need to go to a professional store and use professional equipment to change it. Friends cannot change it by themselves.