What are the three wires on the plug of automobile AC switch? What are the functions of the three lines?

There are four wires on the AC switch plug of the car, namely:

1, air conditioning pressure switch control line;

2. AC switch power cord (provided by blower switch);

3. Positive pole of night indicator light of AC switch (controlled by small car light switch);

4. Negative pole of night indicator light of AC switch.

Extended data:

Matters needing attention in the use of automobile AC switch;

1, should I press the ac key for heating in winter?

(1) You can use the heating without pressing the AC switch. Pressing the AC key is to start the compressor, which is to turn on the air conditioner in layman's terms, but it doesn't need to be heated. Because heating is to transfer part of the heat emitted by the original water tank to the carriage, turning on the air conditioner needs to offset part of the engine power, and heating does not affect the power at all.

(2) When air-conditioned warm air is used in dry and cold northern winter, A/C lamp will not only not help heating, but will cause unnecessary power loss due to the operation of compressor. Therefore, when the air-conditioned heater is used in northern winter, its A/C can be completely turned off, which will not have any impact on the air-conditioned heater.

(3) Not suitable for wet and cold southern winter. It is necessary to start A/C to dehumidify the air and then mix the hot air to avoid fogging the glass inside the car.

2. Use the "AC" key during driving time in summer.

(1) In midsummer, the heat is unbearable. It is really necessary to turn on the air conditioner, turn down the temperature and press the "AC" key. But we know that after turning on the cold air conditioner for a period of time, the temperature inside the car will soon drop, and it will even be unbearable cold. At this time, the solution of many friends is to raise the temperature appropriately.

(2) In fact, there is a better way, that is, let the "AC" key return at this time and let the temperature of the wind naturally rise slowly. At this time, because the temperature key is adjusted to the lowest level, it is cool wind in itself, and the aftereffect of refrigeration can effectively keep the temperature inside the car at a suitable temperature for a long time. When the temperature inside the car rises to feel a little hot, press the "AC" button again, and the temperature inside the car will decrease.