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What does sync mean in the car?

The sync button on the car is the synchronization button for the dual/multi-temperature zones of the automatic air conditioner.

It usually appears on relatively high-end vehicle models. The car air conditioner dually represents the control keys of the air conditioning zone. Air-conditioning zoning refers to the reasonable division of the entire air-conditioning area into several temperature control zones based on the difference in air-conditioning load based on load analysis. The purpose of zoning is to enable the air conditioning system to effectively track load changes, thereby improving the indoor thermal environment and reducing air conditioning energy consumption.