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Refrigerant System Tests

WARNING: This page is about a different car, the 2002 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Special Tool(s)
G01274608Courtesy of FORD MOTOR CO.
  1. Connect the R-134a Manifold Gauge Set. For additional information, see MANIFOLD GAUGE SET CONNECTION .
  2. Adjust the climate controls for maximum cooling.
    • Start the engine.
    • Select MAX A/C operation.
    • Set the blower motor speed to maximum.
  3. Stabilize the in-vehicle temperature at 21-27°C (70-80°F).
    4. NOTE: When the ambient temperatures exceed 38°C (100°F), do not run the engine above normal idle speed.
    Fig 2: Maintaining 1500 RPM
    G01274609Courtesy of FORD MOTOR CO.
  4. Maintain the engine speed at 1500 RPM.
  5. Determine the compressor discharge (high) pressure.
    1. Record the ambient temperature.
    2. Record the discharge (high) pressure.
      3. NOTE: In ambient temperatures between 38-43°C (100-110°F), the system performance pressures will be the same as those for ambient temperatures shown on the chart in the 32-38°C (90-100°F) range.
    3. The system performance is acceptable when the pressure reading falls between the upper and lower limits shown.
    Fig 3: Acceptable Compressor Discharge Pressure
    G01274610Courtesy of FORD MOTOR CO.
  6. Determine the compressor suction (low) pressure.
    1. Record the ambient temperature.
    2. Record the suction (low) pressure.
      3. NOTE: In ambient temperatures between 38-43°C (100-110°F), the system performance pressures will be the same as those for ambient temperatures shown on the chart in the 32-38°C (90-100°F) range.
    3. The system performance is acceptable when the pressure reading falls between the upper and lower limits shown.
    Fig 4: Acceptable Compressor Suction Pressure
    G01274611Courtesy of FORD MOTOR CO.
  7. Determine the A/C clutch ON time.
    1. Record the ambient temperature.
    2. Record the A/C clutch ON time in seconds.
      3. NOTE: When the ambient temperature is above 26°C (80°F), the A/C clutch may not cycle.
    3. The system performance is acceptable when the recorded time falls between the upper and lower limits shown.
    Fig 5: Acceptable A/C Clutch On Time
    G01274612Courtesy of FORD MOTOR CO.
  8. Determine the A/C clutch OFF time.
    1. Record the ambient temperature.
    2. Record the A/C clutch OFF time in seconds.
      3. NOTE: When the ambient temperature is above 26°C (80°F), the A/C clutch may not cycle.
    3. The system performance is acceptable when the recorded time falls between the upper and lower limits shown.
    Fig 6: Acceptable A/C Clutch Off Time
    G01274613Courtesy of FORD MOTOR CO.
  9. Determine the total A/C clutch cycle time.
    1. Record the ambient temperature.
    2. Record the time the A/C clutch is engaged plus the time it is disengaged (time ON plus time OFF).
      3. NOTE: When the ambient temperature is above 26°C (80°F), the A/C clutch may not cycle.
    3. The system performance is acceptable when the recorded time falls between the upper and lower limits shown.
    Fig 7: Acceptable Total A/C Clutch Cycle Time
    G01274614Courtesy of FORD MOTOR CO.
  10. Determine the A/C clutch cycle rate per minute.
    1. Record the ambient temperature.
    2. Record the number of A/C clutch cycles occurring in one minute.
      3. NOTE: When the ambient temperature is above 26°C (80°F), the A/C clutch may not cycle.
    3. The system performance is acceptable when the recorded number of cycles falls between the upper and lower limits shown.
    Fig 8: Acceptable A/C Clutch Cycle Rate Per Minute
    G01274615Courtesy of FORD MOTOR CO.
  11. Determine the center A/C register discharge temperature.
    1. Record the ambient temperature.
    2. Record the center A/C register discharge temperature.
      3. NOTE: In ambient temperatures between 38-43°C (100-110°F), the A/C register discharge temperatures will be the same as those for ambient temperatures shown on the chart in the 32-38°C (90-100°F) range.
    3. The system performance is acceptable when the center A/C register discharge temperature falls between the upper and lower limits shown.
    Fig 9: Acceptable A/C Register Discharge Temperature
    G01274616Courtesy of FORD MOTOR CO.
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