III-97
If you find particles of desiccant in the compressor, remove
and replace it and the receiver-drier. Before doing so, back
flush other system components (except the expansion
valve) using a flushing kit. If there are stem type valves
and you isolate the compressor, the rest of the system must
be purged of refrigerant before you can disconnect and
flush system components (Chapter 9 describes the flush-
ing procedure). After flushing, reassemble the components.
Always check the oil level in the compressor, even if you
install a new or rebuilt unit. Tighten all connections and
evacuate the system. Recharge the air conditioner with re-
frigerant and check system operation and performance.
Note: Rotary compressors have a limited oil reservoir. Extra oil
must be added for all truck installations
Condenser Malfunction or System Overcharge
Tip: The air from vents in the cab may be warm. In R-12 systems
there can be bubbles in the sight glass. The high pressure
hoses and lines will be very hot. Don·t forget to check the
engine cooling system components—fan and drive belt, fan
clutch operation, and the radiator shutter.
Troubleshooting & Service Procedures
Figure 8-13
Gauge reading, condenser
malfunction or system
overcharge.
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