After the heater is turned on, the AC switch is also automatically turned on. Why?

It’s getting cold, so car owners must turn on the heater to keep warm when they drive. Maybe careful car owners have discovered such a situation. When the heater is turned on, the AC switch is automatically turned on. What the hell is this? Is it a bug in the air conditioner?

Before answering this question, let’s take a brief look at the car’s air conditioning system.

First of all, you need to know that the cooling and heating of car air conditioners are completely two different systems, which are different from our home air conditioners.

In simple terms, the refrigeration of the automobile air conditioner needs to start the compressor, and the cold air is provided through the work of the compressor. The warm air of the car air conditioner is another route. It does not need to use a compressor, and the warm air provided is from the heat of the antifreeze in the “small water tank”. Does this explain it to everyone?

Therefore, there is no need to turn on the AC switch when the heater is turned on in winter, because the AC switch is the switch of the compressor, which directly determines whether the compressor works. Moreover, it can also be explained from another point of view that turning on the heater will not consume fuel. It only needs a blower to run there to send the hot air into the car, which at most consumes some electricity.

Then, the above problem comes, since the compressor is not needed when the heater is turned on, why does the AC switch automatically Open it?

Master Ji can tell you clearly that this is not a bug of the car air conditioner, and the designer designed it that way. If you also encounter this problem, you should first check whether your blowing direction is on the glass blowing gear. If it is, the AC switch will automatically turn on, which is the default, because the defogging and cooling are the fastest. The designer also designed it to simplify your operation steps.

If you don’t want the AC to turn on automatically, you just need to change the direction of the blower, just don’t blow the glass, it’s that simple .