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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating & Air Conditioning (Service Information) >> Plumbing >> Diagnosis And Testing >> Refrigerant System Leaks >> Leak Test

Leak Test

  1. Begin searching for refrigerant leaks using a high quality UV light to detect the fluorescent refrigerant leak detection dye.
    • Inspect all connections, plumbing fittings, brazed joints, hoses, hose crimps, service ports, compressor housing, pressure relief valve and A/C condenser for dye.
    • Inspect the A/C Condenser including desiccant bag/filter access plug at the bottom of Receiver/Drier, if equipped) for presence of the leak-detection dye.
    • Inspect the evaporator drain tube and condensate for presence of dye, which indicates a leak from the A/C evaporator.
    • If equipped with rear A/C, inspect the underbody refrigerant lines, fittings, rear evaporator drain tube and condensate for presence of dye, which indicates a leak from the rear evaporator.
    • If no leaks are found using a UV light, proceed to Step 2  .
  2. If a leak is not found with the leak detection dye, operate the Heating, Ventilation and Air Conditioning (HVAC) system with the engine at idle under the following conditions for at least 15 minutes, then proceed to Step 3  .
    • Doors or windows open.
    • Transmission in Park or Neutral with the parking brake set (depending on transmission application).
    • A/C heater controls set to outside air, full cool, panel mode, high blower and A/C compressor engaged. (If the A/C compressor does not engage, go to LOW OR EMPTY REFRIGERANT SYSTEM .
    • If equipped with rear A/C, set rear controls to full cool and high blower.
  3. Turn the engine OFF and wait at least 5 minutes.
  4. Insert a leak detector, with the proper tip attached for the refrigerant in the A/C system being checked, in the evaporator drain tube and the instrument panel air outlets, to check for evaporator leaks. Check the evaporator tubes at the A/C expansion valve, for leaks not visible behind the expansion valve. Check around the front of the A/C compressor, for compressor shaft seal leaks. Check between the A/C condenser and radiator for condenser leaks not previously visible.
  5. If equipped with rear A/C, insert the leak detector in the rear evaporator drain tube and rear air outlets. Check the underbody A/C lines and fittings, evaporator tubes and rear A/C expansion valve.
  6. If no leak is found in steps 1-5, remove the caps from the service fill ports, then add several drops of approved refrigerant oil in the ports and inspect for bubbles forming around the valves. If bubbles are present, tighten or replace valve cores as needed and recheck.
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