What is the function of turning on AC with car heater?

[OVera]

AC switch is the cooling switch of the car air conditioning. After pressing the AC switch, the compressor clutch of the car air conditioning will engage, and the engine can drive the compressor to operate. The following are the functions of AC: When the compressor is running, it can continuously compress the refrigerant and deliver it to the evaporator. The refrigerant can continuously expand and absorb heat in the evaporator, thereby cooling the evaporator. The cooled evaporator can cool the air blown by the blower, so that the car air conditioning vents can blow cold air. When using the car heater, there is no need to press the AC button, for the following reasons: The AC button controls the compressor switch, while the heater mainly uses the internal heat circulation of the car to maintain the temperature inside the car. During this process, the compressor does not work, and only the air volume needs to be adjusted. Turning on the AC button may cause unnecessary fuel consumption. There are four precautions for using the heater in winter. Do not use the heater immediately after a cold start: When the car is started cold, the temperature in the radiator is relatively low. If the heater is turned on, it will not only fail to increase the temperature inside the car but also increase the burden on the engine, slow down the engine temperature rise, affect normal use, and increase fuel consumption. It is recommended to wait 8-15 minutes after starting the car before turning on the heater. Control the heater system through the water temperature gauge: Do not turn on the heater when the water temperature gauge is at a low position. When the water temperature gauge reaches the middle position, you can use the heater. When using the heater, it is recommended to first use the external circulation to expel the cold air inside the car, which can quickly increase the temperature inside the car. Turn off the heater when parking for a long time: Especially when waiting for someone, if the time is too long, the heater should be turned off. Keeping the heater on for a long time can easily lead to carbon monoxide poisoning. If the heater needs to be used for a long time, you can leave a small gap in the window. Turn off the heater before turning off the engine: If the heater is not turned off, the next time you start the car, the heater will be turned on before the engine starts, which will affect the car air conditioning over time.