The Correct Method to Activate Car Heater
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The correct steps to activate car heater are as follows: 1. After starting the vehicle, warm up the engine first, open windows briefly before turning on the heater. 2. Set the air circulation mode to internal recirculation, which allows rapid cabin warming and prevents external polluted air from entering during smoggy days. 3. Switch the AC to warm air mode (note: do not press the AC button as it activates cooling function - engaging it during heating will only increase fuel consumption), adjust appropriate fan speed and airflow direction. 4. Once cabin temperature rises, change the circulation mode to external intake to maintain relatively fresh air inside.