TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 365 of 481
TM 9-2320-272-10
3-16
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Table 3-1. Troubleshooting (Contd).
42. AIR CONDITIONER COMPRESSOR FAILS TO START.
Step 1. Check to see if bonnet door is closed (para. 2-27).
If closed, push bonnet door control rod forward to open bonnet door.
Step 2. If closed, check to see if main circuit breaker and/or air conditioner
switches in circuit breaker box are turned off.
If off, turn on main circuit breaker or air conditioner switches.
Step 3. Check to see if power input switch and/or compressor circuit breaker
are turned off.
If off, turn on power input switch or compressor circuit breaker.
Step 4. Check to see if compressor switch is turned to HIGH when starting
air conditioner.
If not, turn compressor switch to HIGH when starting air
conditioner.
SPECIAL PURPOSE KITS:
RADIATOR AND HOOD COVER KIT
43. ENGINE FAILS TO REACH OPERATING TEMPERATURE.
Check to see if radiator cover flap is opened (para. 2-43).
If open, roll cover flap down.
44. ENGINE TEMPERATURE EXCEEDS 200°F (93°C).
Step 1. Check to see if radiator cover flap is closed (para. 2-43).
If closed, roll up cover flap and secure.
WARNING
Extreme care should be taken when removing surge tank
filler cap if temperature gauge reads above 175°F (79°C).
Steam or hot coolant under pressure will cause injury.
Step 2. Check radiator core for obstructions.
If clogged, remove debris (refer to table 2-1).
Step 3. Check coolant level in surge tank.
If low, add coolant to surge tank until at bottom of filler neck.
Step 4. Check for leakage from tank, hoses and hose connections.
If loose, tighten. If still leaking, notify unit maintenance.
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