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What do REST and SYNC mean in a car?

1 Answers

RichardDella

07/30/25 3:19am

REST: Uses the residual heat from the engine for heating after the ignition is turned off. SYNC: All air conditioning zones adopt the settings from the driver's side. SYNC also means synchronization—whenever SYNC is pressed, the other zones of the three-zone air conditioning system immediately synchronize to the temperature set in the driver's zone. Additional information: SYNC in a car likely refers to the synchronization button of a dual-zone automatic air conditioning system. When the button light is on, the temperature from both sides of the car's air vents will be the same and adjust synchronously. This means when you adjust the temperature on one side, both air vents will actually output the same temperature. When the air conditioning is turned on, simply setting different temperatures on both sides will automatically turn off SYNC.

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