Inspection and Verification
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer's concern by operating the climate control system to duplicate the condition.
- 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) fuse(s):
- 4 (30A)
- 25 (10A)
- 46 (5A)
- Smart Junction Box (SJB) fuse(s):
- 15 (10A)
- 30 (5A)
- 45 (5A)
- Blower motor inoperative
- A/C compressor inoperative
- Circuitry open/shorted
- Disconnected electrical connectors
- Cooling fan inoperative
- If the inspection reveals obvious concerns that can be readily identified, repair as necessary.
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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 Data Link Connector (DLC).
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NOTE: The Vehicle Communication Module (VCM) LED prove-out confirms power 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 power 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, HVAC module.
- 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 Continuous Memory Diagnostic Trouble Codes (CMDTCs).
- Clear the continuous DTCs and carry out the self-test diagnostics from the PCM or HVAC module.
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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 HVAC DTCs retrieved are related to the concern, go to the HVAC Module 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 .
- If no DTCs related to the concern are retrieved, GO to SYMPTOM CHART - CLIMATE CONTROL SYSTEMS or GO to SYMPTOM CHART - NVH .