Why is it still hot in the car with the air conditioning on?
4 Answers
If the car still feels hot with the air conditioning on, it may be because the temperature is set in the red indicator zone, causing the air conditioning to heat. Only by setting the temperature at the far end of the blue indicator zone can you achieve good cooling. Another possible reason could be issues with the compressor or radiator in the air conditioning system, or a lack of refrigerant. Car air conditioning refers to the air conditioning device installed in a vehicle, which can cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and improving driving safety. The air conditioning system has become one of the indicators for evaluating whether a car is fully equipped.
I've had a lot of experience with car repairs, and there are several common reasons why the car still feels hot when the air conditioning is on: Insufficient refrigerant is the top issue—it's responsible for cooling the air, and if it leaks, the AC won’t work properly, so it’s normal for the air to not feel cold. A faulty compressor can also cause this; the compressor is like the heart of the AC system, and if it fails, the whole system stops working. A clogged condenser that doesn’t dissipate heat properly can also affect cooling. Additionally, some modern cars may have faulty sensors that misjudge the temperature, leading to poor cooling. I recommend first checking the refrigerant level or the compressor’s condition. Regular maintenance can prevent these issues, especially for older car models where parts are prone to wear. Don’t delay—AC problems in high temperatures can affect driving comfort and safety.
As a seasoned driver, I've experienced multiple instances where the AC wasn't cooling properly: setting it wrong, like setting the temperature too high, thinking 25 degrees would be cool when the system actually needs time to cool down; not adjusting the fan speed high enough, resulting in insufficient airflow; using the external circulation mode which draws in hot air when internal circulation should be used to block out external heat; incorrect vent direction not blowing towards the occupants. Beginners often make these mistakes. It's recommended to start with maximum fan speed and internal circulation for a few minutes to allow air circulation, and regularly clean the filter to prevent clogging. Understanding these details can save money on repairs. Don't rely solely on automatic settings; sometimes manual adjustments are more effective.
The car's AC not cooling well may be due to environmental factors: prolonged parking under sunlight causes dashboard and seats to absorb heat, making it hard for AC to cool quickly; unsealed windows let hot air in, reducing cooling effect; passengers' breathing and engine heat transfer also warm the interior. I always open windows for a few minutes to release heat before turning on AC; use sunshades to reduce solar exposure; avoid opening windows at high speed as it lets hot air in. Paying attention to these details improves cooling efficiency, especially in hot summers.
