TM 5-3805-291-23-1
TROUBLESHOOTING WITHOUT A DIAGNOSTIC CODE - CONTINUED
0008 00
Table 8. AC System Troubleshooting - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. Check low and high pressure gage
1. If both readings are below normal, go
1.
Temperature of Air Flow is
to Test 7.
during operation AC.
Partially Cool - Continued.
2. If low pressure gage reading is normal
but high pressure gage reading bounces
or reading is unsteady, go to Test 8.
3. If low pressure gage reading is below
normal but high pressure gage reading
is normal to below normal range, go to
Test 9.
4. If low pressure gage reading does not
change, pressure gage reading is at high
end of normal range, go to Test 12.
5. If low pressure gage reading is above
normal, high pressure gage reading is
below normal, and system is fully
charge, go to Test 13.
7. Perform Refrigerant Leakage Test (WP 1. Recover refrigerant (WP 0223 00) and
0018 00) to determine location of leak.
repair leaks.
2. If a large amount of refrigerant was
lost, perform Refrigerant Compressor
Oil Check (WP 0018 00).
3. Evacuate system and re-charge system
with correct amount of refrigerant (WP
0225 00).
4. After system is charged, operate for a
minimum of 10 minutes (TM 5-3805-
291-10) and perform Performance
Checks for AC System (WP 0018 00) to
verify correct operation of AC system.
8. There is air in system.
Reclaim, evacuate, and recharge AC
system (WP 0222 00).
N OT E
Restriction in high pressure liqud line can cause refrigerant to be
i
removed from evaporator at a faster rate. Restriction can cause
evaporator to be low on refrigerant from inline dryer. Clogged filters
or a failure of blower motor can cause possible restrictions to air
flow.
Restrictions of refrigerant flow areidentified by frost or cold spots
in line. Also, restrictions of refrigerant flow are identified by frost or
cold spots in inline dryer.
Cap all open lines andfittings during repairs.
Ambient temperature is above 70F (21C).
0008 00-94