What do ON and OFF mean in a car's air conditioning system?

1 Answers
LoganLee
07/29/25 12:24pm
ON in a car's air conditioning system means turning the air conditioning on, while OFF means turning it off. These two English terms generally appear on the panel of the car's air conditioning. Adjusting to the ON position indicates activating a certain function, while adjusting to the OFF position indicates deactivating it. The car's air conditioning is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car to an optimal state, providing the driver with a comfortable riding environment and effectively reducing travel fatigue. The car's air conditioning, as a ventilation device, plays an important role in creating favorable working conditions for the driver and ensuring safe driving. There is also an A/C button on the car's air conditioning, the function of which is to activate the cooling effect of the car's air conditioning, generally used in summer. In winter, when the car needs warm air, there is no need to press the A/C button. However, if the windshield fogs up too much, affecting the driver's visibility, the A/C button can be turned on. The car's air conditioning system not only has cooling and heating functions but also ventilation capabilities, filtering the air inside the car. During long-distance driving, the driver should switch to the external air circulation mode about once an hour. Turning on the external circulation can draw fresh air from outside into the car and expel the stale air inside. Prolonged use of the internal circulation mode can easily lead to oxygen deprivation. Precautions for using the air conditioning: When driving in winter, do not turn on the warm air immediately after starting the car, as the engine is still cold and cannot produce warm air. The car should be preheated first, and the warm air should be turned on only after the engine temperature or water temperature rises. Then, turn off the AC button of the air conditioning, adjust the air volume and direction of the air conditioning to a comfortable position, and set the temperature button of the air conditioning to the red zone where it feels comfortable, allowing warm air to come out of the vents. Warm air is generated by the heat dissipation of the engine. The fan in the engine compartment blows the heat collected by the cooling system into the car. If the warm air is not turned on, this heat will be wasted by being expelled outside the car. The air conditioning switch controls the car's air conditioning compressor system. Since turning on the warm air only utilizes the heat circulation inside the car, there is no need to activate the compressor. Therefore, there is no need to turn on the air conditioning switch to activate the warm air.
Was this review help?
7
0
Share
More Forum Discussions

What to Do When an Electronically Injected Diesel Vehicle Emits Black Smoke?

It is caused by incomplete combustion due to uneven or excessive fuel supply in each cylinder or premature injection timing, among other reasons. It is recommended to seek inspection at a professional repair shop. Remove the air filter and observe the exhaust smoke color. If the black smoke emission improves, the issue is caused by severe dirt accumulation in the air filter. Cleaning it promptly should resolve the problem. Check whether the fuel supply timing is too early and adjust it if necessary. During engine operation, conduct a fuel cut-off test cylinder by cylinder. If cutting off fuel to a specific cylinder results in reduced engine speed, decreased black smoke, and weaker knocking sounds, it indicates excessive fuel supply to that cylinder.
5
2
Share

What are the precursors to timing chain problems?

Here are the precursors to timing chain failure: 1. Abnormal noises. While driving, if you hear occasional "clicking" friction sounds from the engine or notice a significant change in the usual engine noise, it indicates a timing chain issue, and prompt inspection and replacement are recommended. 2. Increased fuel consumption. After driving a certain mileage, the car may experience varying degrees of increased fuel consumption, which could be caused by timing chain failure. 3. Reduced power output. A decrease in the car's power output is largely due to the engine and related component configurations. Once the timing chain fails, it can restrict cylinder movement and affect the intake and exhaust functions.
6
2
Share

How to Submit Driver's License Medical Examination Information to 12123?

Download the Traffic Management 12123 app, register and log in, then bind your personal information. After logging into Traffic Management 12123, click on "Service Locations" and then "Location" in sequence. In the regional list, click to locate or select a specific city. After automatically returning to the service locations page, click on "More". In the pop-up box under the "Driver's License Services" section, click on "Submit Physical Condition Certificate". The page will display locations where you can submit your medical examination report along with relevant information. You can choose a location to submit your medical examination information.
19
1
Share

Is the T-Roc's Transmission Dry or Wet?

The T-Roc is equipped with both dry and wet transmissions, depending on the model. Except for the 1.4T high-power four-wheel-drive version, all other models are equipped with the DQ200 dry dual-clutch transmission. The 1.4T high-power four-wheel-drive version is equipped with the DQ381 wet dual-clutch transmission. The T-Roc's body dimensions are 4318 mm in length, 1819 mm in width, and 1582 mm in height, with a wheelbase of 2680 mm. The T-Roc is powered by three engines: a 1.2-liter turbocharged engine, a low-power version of the 1.4-liter turbocharged engine, and a high-power version of the 1.4-liter turbocharged engine.
16
5
Share

What is the difference between internal and external tire pressure monitoring?

The differences between internal and external tire pressure monitoring: 1. Different installation locations: Internal tire pressure monitoring installs the sensor inside the tire; external tire pressure monitoring installs the sensor outside the tire. 2. Different installation methods: Installing internal tire pressure monitoring requires professional assistance to remove the tire and cannot be done by oneself; installing external tire pressure monitoring is relatively simple and can be done by the car owner themselves. Direct tire pressure monitoring systems work by installing four tire pressure monitoring sensors inside the tires, automatically monitoring tire pressure and temperature in real-time whether the vehicle is stationary or in motion, and providing timely alerts for high pressure, low pressure, and high temperature to prevent traffic accidents caused by tire failures, ensuring driving safety.
4
3
Share

How to Remove the Mondeo Electric Fan?

Mondeo electric fan removal method is as follows: 1. First open the car's hood and remove the intake pipe located above the fan; 2. The electric fan and air conditioning fan are located on the fan bracket, with four corners in total. Each corner has a screw. Use professional tools to unscrew these four screws; 3. When all screws are removed, the fan can be taken off the vehicle. The working principle of the electric fan is that the car's electric fan is controlled by a thermostat. When the water temperature rises to the upper limit, the thermostat turns on the power and the fan starts working. When the water temperature drops to the lower limit, the thermostat turns off the power and the fan stops working.
7
3
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.