Practice question

The preferred method to leak test a school bus A/C system after repair before recharging is to:

  1. Pressurize with nitrogen and trace gas or use an electronic leak detector / UV dye
  2. Run the bus until cooling fails
  3. Apply soapy water to the dash
  4. Charge fully and watch the sight glass

Answer: A — Pressurize with nitrogen and trace gas or use an electronic leak detector / UV dye

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