Vehicle: 2008 Lincoln Navigator, 2WD, V8-5.4L, Automatic Transmission
Problem: This Navigator came because the auto climate control with rear A/C stopped working.
Details: When checked, the compressor was not coming on – even when the defrosters were activated. All the fuses were good and there were no diagnostic trouble codes in any modules.
The Tech-Assist consultant suggested connecting a scan tool to make sure there was a “YES” or “ON” for the A/C Request PID when the system was activated. If so, he asked the tech to make sure there is power at the A/C relay and ground control from the PCM. If the refrigerant charge is full and everything checks out good, he would suspect a failed clutch coil.
Confirmed Repair: All the suggested tests proved out good, so the technician tested the compressor clutch coil. It was OPEN. He replaced the compressor/clutch assembly and the Lincoln was fixed.
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