Inspection and Verification
WARNING: This page is about a different car, the 2013 Ford F-550 Super Duty, 2013 Ford F-450 Super Duty, 2013 Ford F-350 Super Duty, and 2013 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern by operating the climate control system to duplicate the condition.
- Visually inspect for obvious signs of mechanical or electrical damage.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
- BJB fuse(s):
- 23 (40A)
- 35 (10A)
- 47 (10A)
- 50 (10A)
- BCM fuse(s):
- 37 (10A)
- 46 (10A)
- Blower motor inoperative
- A/C compressor inoperative
- Circuitry open/shorted
- Disconnected electrical connectors
- Cooling fan inoperative
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
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NOTE: Make sure to use the latest scan tool software release.
If the cause is not visually evident, connect the scan tool to the DLC.
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NOTE: The VCM LED prove-out confirms voltage and ground from the DLC are provided to the VCM.
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 , No Power To The Scan Tool, to diagnose no voltage to the scan tool.
- 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 to diagnose no response from the PCM.
- Carry out the network test.
- If the scan tool responds with no communication from one or more modules, refer to MODULE COMMUNICATIONS NETWORK .
- If the network test passes, retrieve and record the CMDTCs.
- Clear the CMDTCs and carry out the self-test diagnostics from the PCM, HVAC module - EMTC or HVAC module - DATC.
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NOTE: Some PCM DTCs may inhibit A/C operation. If any PCM DTCs are retrieved, diagnose those first. Refer to the PCM DTC Chart .
If the PCM DTCs retrieved are related to the concern, go to the PCM DTC Chart . If the HVAC DTCs retrieved are related to the concern, go to the HVAC Module DTC Chart . For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES .
- If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART - CLIMATE CONTROL SYSTEMS or GO to SYMPTOM CHART - NVH .