TM 9-2320-289-34
Table 2-2. Electrical Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR CONDITIONER
1.
COOLING INSUFFICIENT
Step 1.
Test air conditioning system, (See paragraph 10-20) Record low and high pressure
readings,
If low and high pressure readings are within specifications, system is
operational.
If high pressure reading is not within specifications, perform step 2.
Step 2.
Check for 24 volts at light blue lead terminal at 24 volt air conditioner relay.
If there is voltage, system is operational.
If there is no voltage, perform step 3.
CAUTION
DO NOT operate air conditioner for extended periods with condenser
cover assembly removed. Failure to follow this caution may result in
damage to air conditioning system due to high head pressure.
Step 3.
Remove condenser cover assembly. (See TM 9-2320-289-20) Attempt to operate
air conditioning system. Trace light blue lead from 24 volt air conditioner relay to
red lead at low pressure switch. (See wiring diagram E-26)
If there is voltage, repair circuit.
If there is no voltage, perform step 4.
Step 4.
Trace circuit to black lead on high pressure switch. (See wiring diagram E-26)
If there is voltage, replace low pressure switch. (See paragraph 10-27)
If there is no voltage, perform step 5.
Step 5.
Remove air conditioner control panel. (See paragraph 10-22) Trace circuit to “A/C
COLD” switch. (See wiring diagram E-26)
If there is voltage, replace high pressure switch. (See paragraph 10-27)
If there is no voltage, perform step 6.
Step 6.
Trace blue lead to “VENT-A/C” switch. (See wiring diagram E-26)
If there is voltage, replace “A/C COLD” switch. (See paragraph 10-22)
If there is no voltage, perform step 7.
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