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A/C Compressor Clutch Coil: Tests

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the battery state of charge (Refer to ELECTRICAL/BATTERY SYSTEM/BATTERY - DIAGNOSIS AND TESTING) .
  2. Connect an ammeter (0 to 10 ampere scale selected) in series with the clutch coil feed terminal. Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the clutch coil.
  3. With the A/C-heater control in the A/C mode and the blower motor at low speed, start the engine and allow it to run at a normal idle speed.
  4. The A/C compressor clutch should engage immediately, and the clutch coil supply voltage should be within two volts of the battery voltage. If the coil supply voltage is OK, go to step  5. If the coil supply voltage is not within two volts of battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as necessary. If there is no voltage reading at the clutch coil, use a DRB III® scan tool and refer to POWERTRAIN DIAGNOSTIC PROCEDURES - DIESEL or POWERTRAIN DIAGNOSTIC PROCEDURES - GAS for testing of the compressor clutch circuit and PCM control. The following components must be checked and repaired as required before you can complete testing of the clutch coil:
    1. Fuses in the junction block (JB) and the power distribution center (PDC)
    2. A/C heater mode control
    3. A/C clutch relay
    4. A/C high pressure switch (diesel engine)
    5. A/C low pressure switch
    6. Powertrain control module (PCM) or the engine control module (ECM) (depending on engine application)
  5. For the acceptable A/C clutch coil current draw specifications refer to SPECIFICATIONS  . Specifications apply for a work area temperature of 21° C (70° F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts.
    • If the A/C clutch coil current reading is zero, the coil is open and must be replaced.
    • If the A/C clutch coil current reading is above specifications, the coil is shorted and must be replaced.
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