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
4.
High Pressure (Liquid Line)
is Very Hot. Compressor
The compressor is not operating under ambient temperatures that are
May Become Noisy and
extreme. Compressor is not operating under high humidity that is extreme.
Drive Belt May Slip.
1. Check low and high pressure gage
1. If low pressure gage reading is above
during operation of AC (WP 0018 00).
normal and high pressure gage reading
is above normal, go to Test 2.
2. If readings are not as specified, exit this
Malfunction.
2. The system is overcharged.
1. 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.
Check non-return valve for proper
5.
Water is in Vents and
positioning and direction.
Leaking from Unit.
1. Check low and high pressure gage
1. If low pressure gage reading is above
6.
Compressor Will Not
during operation of AC (WP 0018 00).
normal and high pressure gage reading
Engage. Air Flow to
is below normal, go to Test 2.
Operator's Compartment is
2. If readings are not as specified, exit this
Warm.
Malfunction.
2. Check AC compressor (WP 0192 00).
(a) Check wire connectors on
thermostatic switch and on
compressor clutch.
(b) Check for broken insulation.
(c) Check for clutch coil resistance of
17.6 0.6 Ohms with a
(d) Check for proper electrical ground
at magnetic clutch.
