Driver's license written test question bank, effective 2026-03-09

592. Which of the following correctly describes how an air-conditioner in a vehicle should be used and maintained?

  1. ①Turn on the air-conditioner to full and then turn it down to a lower level.
  2. ②Replace the coolant every six months.
  3. ③The ideal temperature setting for an air-conditioner is 16°C.
  4. ④Operate the air-conditioner in outer air inflow mode for greater cooling efficiency.
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Answer ①

The English PDF has no explanation for this question. The Korean page carries the official explanation. Korean version of this question

Source KoROAD Safe Driving Integrated Civil Service, Driver's License Written Test Question Bank [English] (effective 2026-03-09), post 1923, Download the source PDF source PDF page 173 (checked on 2026-09-04). The question and answer are the KoROAD text as published. The buttons and notes on this page were written by the developer and have not yet been checked by a native speaker. The questions and answers themselves are the official KoROAD text.