TM 5-3805-290-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 8. Air Conditioning System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
N OT E
Temperature of Air Flow is
1.
Partially Cool - Continued.
Compressor has internal leaks.
Read valve has leakage.
Compressor piston, rings, or cylinders are worn.
8. Check drive belt for damage or
If belt is loose or damaged, replace or
looseness.
adjust belt (WP 0046 00) as necessary.
9. Perform Refrigerant Leakage Test (WP 1. If an internal leak is found, replace
0018 00) to isolate problem.
compressor (WP 0192 00). Replace
inline dryer (WP 0194 00).
2. If an external leak such as a hose
connection is found, recover
refrigerant (WP 0191 00) and repair
leaks.
3. Evacuate and charge system with
correct amount of refrigerant. Measure
refrigerant by weight (WP 0191 00).
4. If a large amount of refrigerant was
lost, perform Refrigerant Compressor
Oil Check (WP 0018 00).
5. After system is charged, operate for a
minimum of 10 minutes (TM 5-3805-
290-10) and perform Performance
Checks for Air Conditioning System
(WP 0018 00) to verify correct
operation of AC system.
1. Check low and high pressure gage
1. If low pressure gage reading is below
2.
Temperature of Air Flow is
during operation of AC (WP 0018 00).
normal and high pressure gage reading
Warm.
is above normal, go to Test 2.
2. If low and high pressure gage readings
are too high, go to Test 3.
2. There is air or moisture (water) in
1. The desiccant may be full of moisture.
system.
Recover refrigerant (WP 0191 00) and
replace inline dryer (WP 0194 00).
Evacuate and charge system with
correct amount of refrigerant. Measure
refrigerant by weight (WP 0191 00).
2. After system is charged, operate for a
minimum of 10 minutes (TM 5-3805-
290-10) and perform Performance
Checks for Air Conditioning System
(WP 0018 00) to verify correct
operation of AC system.