When the car just started, the internal lubrication of the engine was not enough and the temperature of the water tank was relatively low. At this time, turning on the warm air is not only not conducive to the increase of the temperature in the car, but also increases the load of the engine, and the fuel consumption is certain. The normal practice should be to start it for about 5 minutes, and then turn on the warm air after the water temperature rises. The A/C key is to start the compressor, which is to turn on the air conditioner in layman's terms. Car warm air is the heat generated by the car using its own thermal cycle, and it doesn't need a compressor to work, so it costs oil to press it.
Million car purchase subsidy