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Refrigerant System Tests

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    NOTE: Ambient Temperature at or Below 38C (100F)
  1. Drive the vehicle or run the engine until it reaches normal operating temperature.
  2. Connect the air conditioning service unit to the refrigerant system.
  3. Set the climate controls.
  4. Set temperature to (lowest possible temp setting) with the dual function disabled (if equipped). Manually set blower on HI. If the vehicle has a fresh air/recirc button, set it to FRESH. If the vehicle has an Air Conditioning (A/C) switch or compressor on switch, set it to Air Conditioning (A/C) ON.
  5. Open all vehicle windows and leave the hood open for the test. Open the rear doors.
  6. Confirm the compressor is operating and the engine cooling fan(s) are operating or engaged. Allow the vehicle to idle until the suction (low-side) and discharge (high-side) pressures are stable or fluctuate in a range that repeats.
  7. Record the ambient (shop) temperature.
  8. Record the discharge pressure. If the pressure is fluctuating, record the average value.
  9. Determine if the discharge pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures chart.
    Fig 1: Normal Refrigerant Discharge Pressures-Temperatures Chart
    G08065285Courtesy of FORD MOTOR CO.
  10. Record the suction pressure. If the pressure is fluctuating, record the average value.
  11. Determine if the suction pressure falls between normal operating limits using the Normal Refrigerant Suction Pressures chart.
    Fig 2: Normal Refrigerant Suction Pressures-Temperatures Chart
    G08065286Courtesy of FORD MOTOR CO.
  12. Proceed to the Diagnostic Table.
      NOTE: Ambient Temperature Above 38C (100F)
    1. Drive the vehicle or run the engine until it reaches normal operating temperature.
    2. Connect the air conditioning service unit to the refrigerant system.
    3. Set the climate controls.
    4. Set temperature to (lowest possible temp setting) with the dual function disabled (if equipped). Manually set blower on HI. If the vehicle has a fresh air/recirc button, set it to FRESH. If the vehicle has an Air Conditioning (A/C) switch or compressor on switch, set it to Air Conditioning (A/C) ON.
    5. Open all vehicle windows and leave the hood open for the test. Open the rear hatch and/or rear doors (if equipped).
    6. Confirm the compressor is operating and the engine cooling fan(s) are operating or engaged. Allow the vehicle to idle until the suction (low-side) and discharge (high-side) pressures are stable or fluctuate in a range that repeats.
    7. Record the ambient (shop) temperature.
    8. Record the discharge pressure. If the pressure is fluctuating, record the average value.
    9. Determine if the discharge pressure falls within the normal operating limits using the Normal Refrigerant Discharge Pressures chart.
      Fig 3: Normal Refrigerant Discharge Pressures-Temperatures Chart
      G08065287Courtesy of FORD MOTOR CO.
    10. Record the suction pressure. If the pressure is fluctuating, record the average value.
    11. Determine if the suction pressure falls between normal operating limits using the Normal Refrigerant Suction Pressures chart.
      Fig 4: Normal Refrigerant Suction Pressures-Temperatures Chart
      G08065288Courtesy of FORD MOTOR CO.
    12. Proceed to the Diagnostic Table.
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