TB 9-2320-302-13&P-3
A/C TROUBLESHOOTING PROCEDURES
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
GENERAL TROUBLESHOOTING
1. Inspect evaporator assembly filter (WP
1. Replace filter if obstructed.
1.
A/C Unit Not Producing Cool
Air.
2. If filter is not obstructed, proceed
to next step.
Refer to A/C System Pressure
2. Check system pressures to ensure all
Diagnosis in this work package.
components are operating correctly.
3. Check system for leaks (WP 0015 00).
Repair or replace leaking
components and recharge system
1. Set A/C Fan Switch to OFF position (WP
2.
Compressor Noise or Vibration.
2. Turn ignition key switch to OFF position
(TM 9-2320-363-10).
3. Check to see that belt tension is correct
Adjust belt tension (WP 0016 00).
(120 lb).
4. Check to see if compressor is seized.
(a) Remove belt (WP 0016 00).
(b) Attempt to rotate compressor by
Replace compressor (WP 0016 00).
hand.
5. Check alignment of pulley.
Align pulley (WP 0016 00).
6. Check compressor mounting bolts for
Tighten compressor mounting bolts
tightness.
7. Check if system is overcharged. System
1. Recover refrigerant (WP 0015 00).
should contain 3.25 lb of refrigerant.
2. Recharge system (WP 0015 00).
1. Troubleshoot compressor and thermostat Replace compressor (WP 0016 00) or
3.
Frozen Evaporator Assembly
(refer to A/C Electrical Troubleshooting, thermostat (WP 0017 00).
Coil - Reduced Air Flow.
Malfunction, step 5).
Refer to A/C System Pressure
2. Verify A/C system pressures (WP 0015
Diagnosis in this work package.
3. Inspect wiring harness inside evaporator
assembly for damage. Remove
evaporator assembly cover (WP 0017
00) to access wiring harness.