TM 9-2320-302-20
0017 00-4
AIR CONDITIONING SYSTEM TROUBLESHOOTING AND TESTING - CONTINUED
0017 00
PERFORMANCE TESTS - CONTINUED
(3)
Shut down engine and, to prevent accidental electric shock or shorting during dash assembling, disconnect
batteries.
(4)
Assemble dash.
8.
Line Restrictions.
a.
A restricted suction line causes low suction pressure at compressor and little or no cooling. A restriction in a line
between compressor and expansion valve can cause high discharge and low suction pressure and insufficient cool-
ing.
b.
Usually, areas of ice or frost buildup mean a blockage. Parts that often freeze up are probably corroded or inopera-
tive and should be replaced. Parts (such as expansion valve) that freeze up once in a while may do so because of
moisture in system, which will cause the moisture indicator element to turn white or pink. If this happens, notify
your supervisor.
