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Why does the AC light turn on automatically when the heater is on?

1 Answers

Peterson

07/30/25 8:57am

The reasons why the AC light turns on automatically when the heater is on are as follows: 1. It is caused by turning on the windshield defogger switch. 2. It is due to the design by the manufacturer's engineers. Simply press the AC button to turn it off, which will not affect the use of the car heater. Precautions for using the car heater: 1. Turning on the heater will increase fuel consumption. The car heater and air conditioner operate on completely different principles. When turning on the heater, do not press the A/C button, as it is the compressor start button. Simply adjust the air volume to blow out warm air. 2. Do not turn on the heater immediately after starting the engine. It is recommended to drive for a while until the water temperature gauge reaches the middle position or the blue indicator light goes off before using the heater. It is also advisable to first turn on the external circulation to expel the cold air inside the car, then switch to internal circulation after a few minutes to enjoy the warm air. 3. When fog forms inside the car, you can adjust the heater's airflow direction to blow toward the windshield. The warm air will quickly dry the moisture on the glass, and as the glass temperature rises, the fog will no longer condense. 4. Turn off the heater before shutting down the engine, as prolonged use can damage the engine and shorten its lifespan. 5. During winter, the car interior is often in a sealed state. It is recommended to replace the air filter in advance to prevent respiratory diseases.

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