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HOMESERVICE MANUALSLINCOLN2009NAVIGATOR L RWDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICSDIAGNOSIS AND TESTINGCLIMATE CONTROL SYSTEMINSPECTION AND VERIFICATION
2009 Lincoln Navigator L RWD

Inspection and Verification

2009 Lincoln Navigator L RWDSECTION Inspection and Verification
  1. Verify the customer's concern by operating the climate control system to duplicate the condition.
  2. Inspect to determine if one of the following mechanical or electrical concerns apply:
    VISUAL INSPECTION CHART

    Mechanical Electrical
    • Loose, missing or damaged A/C compressor drive belt
    • Loose or disconnected A/C clutch
    • Broken or binding door/actuator
    • Broken or leaking refrigerant lines
    • Obstructed in-vehicle temperature sensor
    • Disconnected in-vehicle temperature aspirator hose
    • Battery Junction Box (BJB) fuses:
      • 30 (10A)
      • 32 (40A)
      • 34 (30A)
      • 57 (10A)
      • 79 (10A)
    • Smart Junction Box (SJB) fuses:
      • 15 (10A)
      • 37 (10A)
      • 46 (7.5A)
    • Blower motor inoperative
    • A/C compressor inoperative
    • Circuitry open/shorted
    • Disconnected electrical connectors
    • Cooling fan inoperative
  3. If the inspection reveals obvious concerns that can be readily identified, repair as necessary.
    4. NOTE: Make sure to use the latest scan tool software release.
  4. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    5. NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM  .
  5. If the scan tool does not communicate with the VCM  :
    • check the VCM  connection to the vehicle.
    • check the scan tool connection to the VCM  .
    • refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no power to the VCM  .
  6. If the scan tool does not communicate with the vehicle:
    • verify the ignition key is in the ON position.
    • verify the scan tool operation with a known good vehicle.
    • refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the PCM, HVAC module - Electronic Manual Temperature Control (EMTC) or HVAC module - Dual Automatic Temperature Control (DATC).
  7. Carry out the network test.
    • If the scan tool responds with no communication from one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
    • If the network test passes, retrieve and record the Continuous Memory Diagnostic Trouble Codes (CMDTCs).
  8. Carry out the on-demand self-test diagnostics from the PCM, HVAC module - EMTC  or HVAC module - DATC  and retrieve continuous DTCs for the HVAC module - EMTC  or HVAC module - DATC  .
    9. NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC CHART .
  9. If any HVAC module - DATC  DTCs retrieved are related to the concern, go to the HVAC MODULE - DUAL AUTOMATIC TEMPERATURE CONTROL (DATC) DTC CHART . If any HVAC module - EMTC  DTCs retrieved are related to the concern, go to the HVAC MODULE - ELECTRONIC MANUAL TEMPERATURE CONTROL (EMTC) DTC CHART . If the PCM DTCs retrieved are related to the concern, go to the PCM DTC CHART . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  10. If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART - CLIMATE CONTROL SYSTEMS .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.