Should You Use Internal or External Air Circulation for Car AC in Winter?

[DonovanAnn]

When using the car AC in winter, both internal and external air circulation modes should be utilized. Here are detailed instructions: 1. First set the AC to internal circulation mode to rapidly warm up the cabin. After feeling sufficiently warm, switch to external circulation to facilitate air flow. 2. The optimal heating temperature is 23°C. Adjust vent direction away from the face to prevent fatigue and ensure driving safety - direct airflow toward legs and feet instead. 3. The heating system utilizes the vehicle's own heat cycle without requiring compressor operation, so there's no need to press the AC button. 4. Upon cold start, engine oil requires 3-5 minutes to properly lubricate all components. Premature heating activation increases friction resistance and engine load, resulting in higher fuel consumption. The correct procedure is to wait until coolant temperature rises before activating the heating system.