Inspection and Verification

WARNING: This page is about a different car, the 2015 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.

1.

Verify the customer concern by operating the climate control system to duplicate the condition.

2.

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/humidity sensor	BJB fuse(s): 18 (40A) 39 (30A) 62 (10A) 70 (15A) 92 (5A) 93 (5A) Blower motor inoperative A/C compressor inoperative Circuitry open/shorted Disconnected electrical connectors Cooling fan inoperative

3.

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.

4.

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.

5.

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.

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 , The PCM Does Not Respond, to diagnose no response from the PCM.

7.

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.

8.

Clear the CMDTCs and carry out the self-test diagnostics from the PCM, HVAC module.

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 .

If the PCM DTCs retrieved are related to the concern, go to the PCM DTC Chart . If the HVAC module DTCs retrieved are related to the concern, go to the HVAC Module DTC Chart . For all other DTCs, refer to Multifunction Electronic Modules .

10.

If no DTCs related to the concern are retrieved, GO to Symptom Chart - Climate Control Systems or GO to Symptom Chart - NVH .