Crossfire V6-3.2L VIN L (2004)
Compressor Clutch Coil: Testing and Inspection
For circuit descriptions and diagrams, refer to the appropriate wiring diagrams. The battery must be fully-charged before performing the following tests.
Refer to Battery for more information.
1. Connect an ammeter (0 to 10 ampere scale) in series with the clutch coil terminal. Use a voltmeter (0 to 20 volt scale) with clip-type leads for
measuring the voltage across the battery and the compressor clutch coil.
2. With the a/c heater mode control switch in any a/c mode, the a/c heater control a/c switch in the ON position, and the blower motor switch in the
lowest speed position, start the engine and run it at normal idle.
3. The compressor clutch coil voltage should read within 0.2 volts of the battery voltage. If there is voltage at the clutch coil, but the reading is not
within 0.2 volts of the battery voltage, test the clutch coil feed circuit for excessive voltage drop and repair as required. If there is no voltage
reading at the clutch coil, use a DRBIII(R) scan tool and the appropriate diagnostic information for testing of the compressor clutch circuit. The
following components must be checked and repaired as required before you can complete testing of the clutch coil:
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A/C heater control module mode control switch
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A/C pressure transducer
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A/C evaporator temperature sensor
4. The compressor clutch coil is acceptable if the current draw measured at the clutch coil is 2.0 to 3.9 amperes with the electrical system voltage at
11.5 to 12.5 volts. This should only be checked with the work area temperature at 21° C (70° F). If system voltage is more than 12.5 volts, add
electrical loads by turning on electrical accessories until the system voltage drops below 12.5 volts.
a. If the clutch coil current reading is four amperes or more, the coil is shorted and should be replaced.
b. If the clutch coil current reading is zero, the coil is open and should be replaced.
