A clear sight glass means that the system has
enough refrigerant to work properly, or that it is
completely out of refrigerant, or that it is over-
charged.
A cloudy sight glass means that dirt or broken-
down bits of desiccant are flowing through the
system. This is a serious condition that requires
complete flushing of the system, installation of a
new receiver-drier, and, if the desiccant cartridge
of the receiver-drier has fallen apart, installation
of a new refrigerant compressor and expansion
valve.
Oil streaks in the sight glass mean low refriger-
ant, or too much oil in the system.
12/16/93
f250177b
1
2
1. Moisture Indicator Sight Glass
2. Receiver-Drier Sight Glass
Fig. 1, Receiver-Drier
Heater and Air Conditioner83
Business Class Trucks Maintenance Manual, January 199883/2
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