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Why is the air conditioner not blowing hot air?

2 Answers

LaMaggie

07/28/25 7:58pm

The reasons why the air conditioner is not blowing hot air are: 1. The vehicle has just started, and the engine temperature has not yet risen; 2. Insufficient coolant; 3. Damaged water pump, leading to a failure in the coolant circulation system; 4. Blocked heater core; 5. Faulty radiator fan. The functions of the air conditioner: 1. Achieve cooling effect by continuously transforming and circulating refrigerant; 2. Draw in fresh external air to ventilate and exchange air, preventing windshield fogging; 3. Use engine coolant, waste heat, or heat generated by a burner as a heat source for warming, heating through the heater, and then blowing into the cabin with a blower to raise the temperature and achieve heating; 4. Remove dust, odors, smoke, and toxic gases from the air inside the car, making the cabin air fresher, and humidify the cabin air to increase its relative humidity.

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StAaliyah

08/12/25 12:48am

I've been driving for 30 years and have encountered the issue of the AC not producing warm air several times. The main causes are setting the temperature too low without switching to heating mode, or a faulty mode switch that fails to engage the warm air setting. Additionally, refrigerant leaks or insufficient levels can prevent the compressor from working; clogged air filters can restrict airflow; and in winter, low outdoor temperatures can cause the heat pump to frost over, affecting heating performance. A simple diagnostic method: after starting the car, set the temperature above 30 degrees and wait a few minutes to check the air temperature. If there's a strange odor or weak airflow, the filter might need replacing. It's recommended to regularly maintain and replace the filter, and if problems arise, don't delay—visit a repair shop to check the wiring.

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