CREW CAB AIR CONDITIONING DOES NOT OPERATE PROPERLY. (Cont)

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TM-9-2320-279-10-3 M977 Series 8x8 Heavy Expanded Mobility Tactical Trucks (HEMTT) Manual

CREW CAB HEATER DOES NOT OPERATE PROPERLY.

TM 9-2320-279-10-3

Troubleshooting Index (Cont)

Table 3-5.

Troubleshooting

Malfunction

Test or Inspection

Corrective Action

4. CREW CAB AIR CONDITIONER DOES NOT OPERATE PROPERLY

(CONT).

NOTE

Circuit breaker may be in ON position when tripped. To make

sure circuit breaker is not tripped, reset circuit breaker by

switching it to the OFF position then back to ON position.

Step 2.

Check if circuit breakers 12 and 14 are tripped.

If circuit breakers 12 and 14 are tripped, reset circuit

breakers. If circuit breakers trip again, notify

Supervisor.

Step 3. Check if crew cab heater/air conditioner control switch is in the

ON position.

If crew cab heater/air conditioner control switch is not in

the ON position, place switch in the ON position.

Step 4. Check if crew cab heater/air conditioner intake filter is free

from blockage.

If crew cab heater/air conditioner intake filter is blocked,

clear blockage.

Step 5. Check if crew cab air conditioner condenser fan assembly is

free from blockage.

If crew cab air conditioner condenser fan assembly is

blocked, clear blockage.

Step 6. Check if crew cab air conditioner condenser fan power

connectors are connected.

If crew cab air conditioner condenser fan power

connectors are not connected, connect them.

Step 7. Check if crew cab heater fresh air fan assembly is free from

blockage.

If crew cab heater fresh air fan assembly is blocked,

clear blockage.

Step 8. Check if crew cab heater fresh air fan power connector is

connected.

If crew cab heater fresh air fan power connector is not

connected, connect it.

Step 9. If problem still exists, notify Supervisor.

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