Why is the car still hot even with the air conditioner on during the summer?

During the scorching hot summer days, having a fully functional air conditioning system in your car is an absolute necessity. However, there are times when even with the AC on, the air inside the car remains hot. So, what could be the reason behind this discomforting phenomenon?

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The explanation for this is, experts point out the main reasons, which are: leaving the car in the sun for too long, turning on the air conditioning before starting the car, not turning off the air conditioning before getting out of the car or suddenly adjusting the car’s temperature.

Leaving the car in the sun for too long: This action will cause all the equipment from the engine, body, interior to be “cooked” by the hot sun weather, while generating heat when starting the engine. The temperature inside the car thus increases by tens of degrees compared to the outside weather due to being trapped for too long.

Therefore, when starting the engine, even if you turn on the air conditioning, you will still feel hot.

In addition, leaving the car in the sun for too long not only increases the temperature inside the car but also causes the paint and interior of the car to fade and deteriorate.


Do not turn on the air conditioning before starting the car. (Illustrative image).

Turning on the air conditioning before starting the car: Many drivers make the mistake of turning on the car air conditioning when the car has been parked in the hot sun for quite a long time without shade, making the feeling when entering the cabin like an oven. The car hasn’t started yet, but the air conditioning is turned on immediately, causing the battery to have to operate to run the fan and also bear sudden loads. This situation often occurs, not only causing the battery life to decrease quickly but also causing the car to consume a lot of energy.

Therefore, you should start the car before turning on the air conditioning about 5 minutes, combined with opening the door to let hot air escape from the car. Don’t forget to turn off the air conditioning before turning off the engine.

Suddenly adjusting the temperature: Using air conditioning in a car is not simply turning on or off or adjusting the temperature. Many car experts advise that you should not suddenly lower the temperature when the car is parked in a hot sun place and the temperature in the cabin is higher than outside.

You can also open windows during the initial period of movement to allow air circulation. In cases of security assurance, you can lower the window a bit when parking the car so that the cabin is not too hot.

Not turning off the air conditioning before getting out of the car: Many people wait until they step out of the car to turn off the air conditioning, which causes a thermal shock when you step from the cabin into the hot sun outside.

You should turn off the air conditioning system about 5 – 10 minutes before getting out of the car; at the same time, open the windows slightly to let the outside air in to gradually reduce the temperature difference between the inside and outside of the car and help the air conditioning system operate better.

What can be done to make the car air conditioning cooler?

To make the air conditioning work cooler in the car, without affecting the durability and performance of the air conditioning too much, while saving fuel, in addition to avoiding the 4 mistakes mentioned above, you should also maintain and clean the air conditioning system regularly to ensure the system always works well, increase the life of the system and promptly detect malfunctions for repair.

Lower the car window before turning on the air conditioning: Lowering the car window before turning on the air conditioning helps the heat in the car to escape. Parts of the car such as the dashboard, leather seats, door panels, and many other details are made of plastic. These parts, when exposed to hot weather, will emit an unpleasant smell, and lowering the window will help the hot air and unpleasant smell escape.

Therefore, before turning on the air conditioning, you should open the car windows, start the car and turn on the fan to blow the hot air out for 5 minutes, helping the air in the car become ventilated. Note that all windows must be closed after the temperature inside the car is suitable to avoid wasting fuel.


Using air conditioning correctly not only helps the car operate efficiently but also saves significant fuel (Illustrative image).

Not setting the temperature too low: A low temperature will consume more energy. However, more importantly, this can lead to thermal shock when the body steps out of the car. Besides, when using car air conditioning, pay attention to the fan. If the fan is set too high, the energy will also be consumed more, and being hit by the cold fan can also have a negative effect on health.

Adjust the airflow appropriately after turning on the air conditioning: Adjust the fan mode appropriately when opening the air conditioning since when the fan is too high, it will consume more electricity or cause discomfort when the wind blows strongly. If the fan is set too weak, there will be no sensation of coolness. Therefore, adjust the cooling temperature slowly, do not set it at the highest cooling level, which will make the cooling system work too hard.

It is necessary to adjust the vent reasonably to avoid blowing cool air directly onto the face, affecting health, and also avoid blowing air directly on the glass, which will cause water condensation on the car windshield.

Turn off the air conditioning system when entering flooded areas: In case of driving the car in the rain and high-water areas, you should turn off the entire air conditioning system to prevent dirt from flowing with the water stream, which can cause the fan to jam and damage the air conditioning system.

Do not turn off the engine and air conditioning simultaneously: Before stopping the car for about 10 minutes, you should turn off the air conditioning system and open the door for ventilation so that the air can escape outside and then turn off the engine.

According to vtc.vn

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