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Should You Turn Off AC or NO First in Car Air Conditioning?

2 Answers

LolaLynn

07/29/25 6:14am

When using car air conditioning, it is generally recommended to turn off the AC button first, let the fan blow for a while, and then finally turn off the OFF button. Tips for car air conditioning operation: 1. Summer air conditioning techniques: (1) Turn on the fan first before pressing the AC button. (2) Before turning on the air conditioning, open all windows. (4) After cooling for a few minutes, close all windows and switch the air circulation to internal circulation. 2. Winter air conditioning techniques: When heating is needed, first close all windows, turn on the external circulation to force the cold air inside the car to circulate outside.

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AuroraLee

08/12/25 9:25pm

I've been driving for over a decade and have deep feelings about this issue. The correct sequence to turn off the AC is to first switch off the AC button, let the fan continue blowing for a few minutes before turning off the fan. Why? Because when the compressor stops, moisture accumulates in the evaporator. If you turn everything off immediately, the damp environment can easily lead to mold and unpleasant odors. I use the AC every day in summer and have developed the habit of turning off the AC five minutes before parking, letting natural air dry the ducts. Wait until the air vents no longer blow cold air before pressing the fan button to turn it off. This way, for five years, my AC has had no odors, saving me the cost of cleaning the evaporator. If you turn off the fan directly, although the AC compressor will also stop, the condensate won't drain completely, and over time, the air blowing out will have a musty smell.

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