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Heating & Air Conditioning - Non-Dtc Diagnostics: Diagnosis Dodge Dart PF

A/c Compressor ~352 words

COIL RESISTANCE TEST

  1. Disconnect and isolate the negative battery cable.
  2. Disconnect the wire harness connector from the A/C clutch coil connector.
  3. Use an ohm meter and Back Probe Tool (special tool #6801, Terminal Probe) and measure the resistance of the A/C clutch coil at the coil connector terminals.
  4. See the «A/C CLUTCH COIL SPECIFICATIONS»(ref-646334-S08456117962014072800000) chart for the acceptable A/C clutch coil resistance. Specifications apply for a work area temperature of 21° C (70° F). If the A/C clutch coil reading is below specifications, the coil is shorted and must be replaced. If the A/C clutch coil reading is above specifications, the coil is open and must be replaced.

COIL CURRENT DRAW TEST

  1. Verify the battery state of charge. Refer to «BATTERY, DIAGNOSIS AND TESTING»(ref-646227-S18033440632014072800000) .
  2. Connect an ammeter (0 to 10 ampere scale selected) in series with the A/C clutch coil feed terminal using Back Probe Tool (special tool #6801, Terminal Probe). Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the clutch coil.
  3. With the heater-A/C control in the A/C mode and the blower at low speed, start the engine and allow it to run at a normal idle speed.
  4. The A/C 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.
  5. See the A/C CLUTCH COIL SPECIFICATIONS chart for the acceptable A/C clutch coil current draw. 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.
Coil ResistanceCurrent Draw
3.6 ± 0.2 ohms3.2 - 3.3 amps @ 11.5 - 12.5 volts

A/C CLUTCH COIL SPECIFICATIONS

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