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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1680 (HVAC - CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS)DIAGNOSTIC TESTSCLIMATE CONTROL SYSTEMINSPECTION AND VERIFICATION
2009 Mercury Milan Premier, 3.0 1, AWD

Inspection and Verification

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Inspection and Verification
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
  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
    • Central Junction Box (CJB) fuse(s):
      • 9 (7.5A)
      • 15 (10A)
      • 27 (10A)
      • 31 (10A)
    • Battery Junction Box (BJB) fuse(s):
      • 101 (40A)
      • 111 (15A)
      • 21 (15A)
    • Blower motor inoperative
    • A/C compressor inoperative
    • Circuitry open/shorted
    • Disconnected electrical connectors
    • Cooling fan inoperative
  3. As pinpoint tests and measurements are being carried out, be sure to inspect for any disconnected, loose-fitting or incorrectly installed component, module and in-line electrical connectors and pins.
  4. If the inspection reveals obvious concern(s) that can be readily identified, repair as necessary.
    5. NOTE: Make sure to use the latest scan tool software release.
  5. If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
    6. NOTE: The Vehicle Communication Module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
  6. 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 communication with the scan tool.
  7. 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 Rear Audio and Temperature Control (RATC) module, PCM or HVAC module.
  8. 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 DTCs.
  9. Clear the continuous DTCs and carry out the self-test diagnostics for the RATC module, PCM or HVAC module.
    10. NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first.
  10. If the RATC module DTCs retrieved are related to the concern, go the REAR AUDIO AND TEMPERATURE CONTROL (RATC) MODULE DIAGNOSTIC TROUBLE CODE INDEX . If the HVAC DTCs retrieved are related to the concern, go to HVAC MODULE DIAGNOSTIC TROUBLE CODE INDEX . If the PCM DTCs retrieved are related to the concern, go to PCM DIAGNOSTIC TROUBLE CODE INDEX . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
  11. If no DTCs related to the concern are retrieved, go to Symptom Chart - Climate Control System  or Go to Symptom Chart - NVH .
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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.