Why does the car air conditioner sometimes cool and sometimes not?

1 Answers
SanCalvin
07/29/25 4:38pm
Insufficient refrigerant due to low refrigerant levels or compressor issues. Below is an introduction to automotive air conditioning: 1. Introduction to automotive air conditioning: The automotive air conditioning system consists of a compressor, condenser, throttle element, evaporator, fan, and necessary control components, designed to regulate the temperature and humidity inside the vehicle, providing a comfortable environment for the driver. 2. Working principle: When the compressor operates, it draws in low-temperature, low-pressure gaseous refrigerant from the evaporator. After compression, the temperature and pressure of the refrigerant increase, and it is sent to the condenser. Inside the condenser, the high-temperature, high-pressure gaseous refrigerant transfers heat to the outside air passing through the condenser and liquefies, turning into a liquid. The liquid refrigerant then flows through the throttle device, where its temperature and pressure decrease, and it enters the evaporator. Inside the evaporator, the low-temperature, low-pressure liquid refrigerant absorbs heat from the air inside the vehicle passing through the evaporator and evaporates, turning into a gas. The gas is then drawn back into the compressor to begin the next cycle.
Was this review help?
8
5
Share
More Forum Discussions

What is the speed limit for vehicles on urban and rural roads?

Rural roads are generally designed with a speed limit of 20 km/h. For roads without a centerline, the speed limit is 30 km/h for urban roads and 40 km/h for highways. For roads with only one lane in each direction, the speed limit is 50 km/h for urban roads and 70 km/h for highways. Urban road speed limits: The speed limit on urban roads is typically between 40 and 60 km/h, though this may vary in some cities. Drivers arriving in an unfamiliar city must drive slowly and pay attention to speed limit signs to avoid being caught speeding by traffic cameras. Classification of urban roads: Urban roads are divided into regular city roads and expressways. Regular city roads usually have speed limits between 40-60 km/h, while expressways may have a maximum speed limit of 80 km/h. Drivers should always refer to the posted speed limit signs for accurate information.
13
2
Share

What are the differences between the Mercedes-Benz GLC300 Luxury Edition and Sport Edition?

The differences between the Mercedes-Benz GLC300 Sport Edition and Luxury Edition are mainly in the front and rear tire specifications: 1. The GLC300 Sport Edition has front and rear tire specifications of 235/55R19. 2. The Luxury Edition has front and rear tire specifications of 255/45R20. Below are some related details about the Mercedes-Benz GLC300 Sport Edition and Luxury Edition: 1. Both the GLC300 Sport Edition and Luxury Edition have the same body dimensions: length 4764 mm, width 1898 mm, height 1642 mm, wheelbase 2973 mm, fuel tank capacity 66 liters, and trunk capacity 580 liters. 2. Both the GLC300 Sport Edition and Luxury Edition are equipped with a 2.0T turbocharged engine, with a maximum power of 190 kW and a maximum torque of 370 Nm, paired with a 9-speed automatic transmission.
4
4
Share

What to Do When Your Driver's License Points Are Deducted and Your ID Card Is Lost?

After losing your ID card, you should bring your household registration booklet to the household registration hall of the public security bureau in your registered residence as soon as possible to report the loss of your ID card. If you meet the conditions for cross-regional ID card processing, you can complete the replacement procedures at a cross-regional processing point. You can collect your new ID card from the public security authorities after one month. Expedited processing is available, and the new ID card will be mailed to the designated address by the postal department within 10 working days. After obtaining your new ID card, bring it to the vehicle management office to fill out an application form and a statement of lost driver's license. First, the driver's license will be reissued if it is damaged.
6
1
Share

What does the night vision system in cars mean?

Car night vision system is a system that uses infrared technology to make darkness as bright as day, allowing drivers to see farther and more clearly at night. The night vision system consists of two parts: one is an infrared camera, and the other is a light display system on the windshield. More details are as follows: 1. The car night vision system is installed on some high-end models such as the Mercedes-Benz S-Class and BMW 7 Series. This system mainly uses infrared technology to make pitch-black nights as bright as daytime. 2. The infrared system can detect things that the human eye may overlook and sense temperature. Using this system allows the driver to observe more things at night, avoiding some traffic accidents and unexpected incidents. 3. For example, when driving on mountain roads at night, it is difficult for the driver to see things due to the darkness. If an animal suddenly rushes out or something falls, the driver may not notice it in time, leading to traffic accidents. Therefore, using a car night vision system is very helpful for drivers when driving at night.
8
4
Share

How to Spray Windshield Washer Fluid on the Volkswagen Bora?

To spray windshield washer fluid on the Volkswagen Bora: Simply pull the lever on the right side of the steering wheel upward. The performance characteristics of windshield washer fluid are as follows: 1. Cleaning Performance. Windshield washer fluid is formulated with various surfactants and additives. Surfactants typically have functions such as wetting, penetrating, and solubilizing, thereby achieving the effect of cleaning and removing dirt. 2. Anti-freeze Performance. It significantly lowers the freezing point of the liquid, thus providing anti-freeze effects and quickly dissolving frost. 3. Anti-fog Performance. It forms a single-molecule protective layer on the glass surface. This protective layer prevents the formation of fog droplets, ensuring the windshield remains clear and transparent with a clear view. 4. Anti-static Performance. After cleaning with windshield washer fluid, substances adsorbed on the glass surface can eliminate static charges on the glass, providing anti-static properties.
19
0
Share

How to Parallel Park in One Go?

When starting, engage first gear and release the clutch. When you feel the car slightly vibrating, hold the clutch steady to control the speed and move forward slowly. While driving, when the inner left door handle aligns with the front edge line of the parking space, you should stop. Reverse at a low speed and watch the lower edge of the left rearview mirror. When the lower edge of the left rearview mirror is parallel to the front edge line of the parking space, quickly turn the steering wheel fully to the right. After turning the steering wheel fully to the right, pay attention to the right side of the steering wheel. When you see the corner of the parking space while reversing, start slowly turning the steering wheel to the left. Check the distance between the car body and the edge line of the parking space, and adjust the steering wheel left or right as needed to properly position the car body, slowly reversing into the parking space.
7
5
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.