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
2.
Temperature of Air Flow is
Warm - Continued.
Do not operate engine.
With ambient temperature above 70F (21C), normal gage reading
for low pressure side is 10 to 20 psi (70 to 138 kPa) while normal
gage reading for high pressure side is 120 to 190 psi (820 to 1,300
kPa).
The condenser is not functioning properly. System may have a nor-
mal or overcharge of refrigerant.
3. Check for blockage in flow of air
1. If a blockage is found in condenser,
through condenser (WP 0018 00).
remove all blockages.
2. If low pressure gage reading and high
pressure gage readings are too high,
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).
3. 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.
System Only Cools Cab in 1. Check low and high pressure gage
1. If low pressure gage reading is normal,
3.
(gage reading may drop into vacuum
during operation of AC (WP 0018 00).
Morning and in Evening,
range during testing procedure) and
Not During Hot Part of Day.
high pressure gage reading is normal
Air Flow is Very Cold but
and is below normal when low pressure
Air Flow Becomes Warm.
gage drops into vacuum range, go to
Test 2.
2. If readings are not as specified, exit this
Malfunction.
2. The system has a large amount of
1. Recover refrigerant (WP 0191 00) and
moisture. Desiccant in receiver/dryer
replace inline dryer (WP 0194 00).
or inline dryer is full of water. Water is
Evacuate and charge system with
released during high ambient
correct amount of refrigerant. Measure
temperatures. Ice collects in orifice and
refrigerant by weight (WP 0191 00).
ice can block flow of refrigerant.
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.
