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
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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