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- Inspect entire A/C system for signs of oil leakage, corrosion cracks, or other damage. Follow the system in a continuous path so no potential leaks are missed.
- Make sure there is enough refrigerant in system (about 15 percent of system capacity or 50 psi min.) to generate pressure to detect leaks.
- Check all service access port fittings. Check seals in caps.
- Move detector probe at 1" per second within 1/4" of suspected leak area.
- Refrigerant is heavier than air so position probe below test point.
- Minimize air movement in area to make it easier to pinpoint the leak.
- Verify an apparent leak by blowing air into suspected leak to clean the area and see if the leak remains.
- When checking for evaporator leaks, check for gas in condensate drain tube.
- Use heated sensor type detector for difficult-to-detect R-134a, R-410A, R-407C, and R-404A.
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