TM 9-2320-289-20
Table 2-4. Electrical Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
AIR CONDITIONER
1.
COOLING INSUFFICIENT; AIR FLOW NORMAL
Step 1.
Step 2.
Step 3.
Step 4.
Step 5.
Check setting of air conditioner controls. (See TM 9-2320-289-10)
Check compressor belt tension. (See Appendix E)
Adjust if loose.
Check air conditioner compressor clutch/pulley assembly to ensure it is operating.
If clutch/pulley assembly is not operating, check 30 amp flasher, back-up lights,
and accessories fuse. (See paragraph 4-12)
Replace fuse if burned out.
Unplug connector from 24 volt air conditioner relay. (See paragraph 4-13) Check
to see that there are 12.0 volts at orange lead terminal and 24.0 volts at light blue
lead terminal,
If voltage is correct at both leads, replace relay.
If voltage is not correct at both leads, perform step 5.
Unplug Connector from 12 volt air conditioner relay. (See paragraph 4-13) Check
for 12.0 volts at tan lead terminal and 24.0 volts at gray lead terminal.
2. LOW OR NO AIR
If voltage is correct at both leads, replace relay.
If voltage is not correct at both leads, check 25 amp air conditioner fuse.
(See paragraph 4-13) Replace fuse if burned out.
FLOW
Step 1.
Check 20 amp in-line air conditioner blower fuse. (See paragraph 4-13)
Replace fuse if burned out.
Step 2.
Remove air conditioner condenser cover assembly. (See paragraph 10-33) Check
for voltage through each lead from fan switch to resistor. Voltage should be 24.0.
If voltage is not correct through any lead, trace circuit through lead back to
20 amp in-line air conditioner fuse. (See wiring diagram F-26)
If voltage is correct through each lead, perform step 3.
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