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Check Refrigerant Leak Using Electronic Leak Detector

WARNING: This page is about a different car, the 2018 Nissan Titan XD and 2018 Nissan Titan. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Do not check for refrigerant leaks while the engine is running.
CAUTION: Be careful of the following items so that inaccurate checks or misidentifications are avoided.
  • Do not allow refrigerant vapor, shop chemical vapors, cigarette smoke or other contaminants around the vehicle.
  • Always check for refrigerant leaks in a low air flow environment so that refrigerant may not disperse when leak occurs.
  1. Stop the engine.
  2. Connect recovery/recycling/recharging equipment or manifold gauge set to A/C service valve.
  3. Check that A/C refrigerant pressure is 345 kPa (3.52 kg/cm 2 , 50 psi) or more when temperature is 16°C (61°F) or more. When pressure is lower than the specified value, recycle refrigerant completely and fill refrigerant to the specified level.
    NOTE: Leaks may not be detected if A/C refrigerant pressure is 345 kPa (3.52 kg/cm 2 , 50 psi) or less when temperature is less than 16°C (61°F).
  4. Clean area where refrigerant leak check is performed and check refrigerant leaks along all surfaces of pipe connections and A/C system components using electronic leak detector (TIFZX) probe.
    CAUTION:
    • Continue checking when a leak is found. Always continue and complete checking along all pipe connections and A/C system components for additional leaks.
    • When a leak is detected, clean leak area using compressed air and check again.
    • When checking for leaks of cooling unit inside, always clean inside of drain hose so that the probe surface may not be exposed to water or dirt.
    NOTE:
    • Always check leaks starting from high-pressure side and continue to low-pressure side.
    • When checking leak of cooling unit inside, operate blower fan motor for 15 minutes or more at the maximum speed while the engine is stopped, and then insert electronic leak detector probe into drain hose and hold for 10 minutes or more.
    • Before disconnecting shut-off valves that are connected to A/C service valve, always evacuate remaining refrigerant so that misidentification can be avoided.
  5. Repair or replace parts where a refrigerant leak is detected.
  6. Start the engine and set A/C control to the following conditions.
    • A/C switch ON
    • Air flow: VENT (ventilation)
    • Intake door position: Recirculation
    • Temperature setting: Full cold
    • Blower speed: Maximum
  7. Run the engine at approximately 1, 500 rpm for two minutes or more.
  8. Stop the engine. Check again for refrigerant leak. Go to step 4.
    WARNING: Be careful not to get burned when the engine is hot.
    NOTE:
    • Start refrigerant leak check immediately after the engine is stopped.
      G04078061Courtesy of NISSAN NORTH AMERICA, INC.
    • When refrigerant circulation is stopped, pressure on the low-pressure side rises gradually, and after this, pressure on the high-pressure side falls gradually.
    • The higher the pressure is, the easier it is to find the refrigerant leak.
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