Compared to car air conditioner cooling, way to turn on car air conditioner heating is a bit complicated, but you only need to follow steps below:
1. Start car and let engine warm up a bit;
2. After engine has been preheated to a certain extent, i.e. when water temperature reaches approximately 90°, air conditioner can be switched on. (Most cars can see current water temperature on dashboard)
3. After turning on air conditioner, locate air conditioner temperature control knob on center console and turn knob to red area to start heating.
Why warm up engine?
The reason for engine warming up is that air conditioning heating principle is different from cooling principle. Air conditioning refrigeration uses components such as refrigerants and condensers to lower temperature so that air conditioner airflow blowing into car becomes cooler. The heating mainly depends on high temperature generated by engine to heat air from air conditioner blown into car, and there is no other heating process.
Which mode is used to heat car air conditioner?
In fact, no matter whether car air conditioner is heating or cooling, there is not much difference in using air conditioning mode. In beginning, internal circulation is turned on, and then external circulation is turned on. when heating or cooling effect reaches a comfortable level of clean air.
Another point is that car air conditioner usually works in winter, and staying in a warm environment for a long time can cause drowsiness, so in car, you should pay attention to opening window at right time to freshen up, otherwise it will have a big impact on car safety.