Why does the car still blow hot air when the AC is turned on?

[DiKiara]

When the car's AC is turned on but still blows hot air, it could be due to compressor failure or temperature sensor malfunction. Below are the relevant explanations: 1. Compressor failure: If the compressor load is too high, causing the compressor temperature to rise excessively, it will automatically activate protection; if the compressor load is too high or gets stuck due to a malfunction, the generator may suddenly deliver excessive current, triggering the compressor's overcurrent protection. 2. Temperature sensor malfunction: If the air conditioning load is too heavy or heat dissipation is poor, causing the condenser temperature to rise too high, the signal from the temperature sensor will cause the air conditioning compressor to stop working. 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.

[MacRiley]

I've been driving for many years and have encountered this situation several times. Usually, it's because the air conditioning refrigerant is insufficient or leaking, causing the compressor to fail to start, and the air blown out is still the engine's hot air. It could also be that you set the temperature too high or didn't adjust it correctly, and the blend door is stuck in the hot air position and can't switch over. A dirty filter that blocks airflow can also be a factor. In summer, when the car gets extremely hot from the sun, the air conditioning initially blows hot air and cools down slowly. I check the air filter every six months, clean out the dust to prevent clogging, which saves fuel and makes driving more comfortable. If the compressor is broken or there's an electrical issue, the dashboard light stays on without any response, so hurry to a 4S shop for repairs to avoid delaying your drive. Usually, parking away from direct sunlight improves the air conditioning effect significantly.

[MorganLynn]

As a car enthusiast, I often ponder these minor issues. The main reasons for hot air coming out when the AC is turned on include refrigerant insufficiency due to leaks in the cooling circuit, worn-out compressor bearings causing it to malfunction, or dust accumulation on the condenser surface hindering heat dissipation and reducing efficiency. A faulty blend door allowing hot air to mix in or inaccurate temperature readings from sensors can also be triggers. It's recommended to first check the vent temperature manually; if abnormal, inspect whether the filter has been cleaned. Regular maintenance can prevent system overheating and damage, and timely repairs avoid increased fuel consumption and compromised driving comfort, especially during long trips.

[OKyle]

When I first learned to drive, I was particularly afraid of these malfunctions. Later, I realized that the AC blowing hot air is a common issue. It's mostly due to problems in the AC system, such as refrigerant leaks or compressor failure, or it could be an incorrect air mixing mode setting. A dirty filter blocking the airflow can also make it seem hot. I consulted my car repair friends, and they said regular filter cleaning is simple and effective, and don't forget to check the refrigerant pressure. Blowing hot air for too long makes the car uncomfortable and wastes fuel, so it's best to get it fixed promptly when you notice the problem.