CREW CAB HEATER DOES NOT OPERATE PROPERLY.

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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

DECKLIGHTS DO NOT OPERATE.

TM 9-2320-279-10-3

Troubleshooting Index (Cont)

3-16. TROUBLESHOOTING MALFUNCTIONS (CONT).

Table 3-5.

Troubleshooting

Malfunction

Test or Inspection

Corrective Action

5. CREW CAB HEATER DOES NOT OPERATE PROPERLY.

CREW CAB HEATER/AIR CONDTIONER

FRESH AIR FAN ASSEMBLY

tfft00411

CREW CAB HEATER/AIR

CONDITIONER CONTROL SWITCH

CREW CAB HEATER

FRESH AIR FAN POWER

CREW CAB HEATER/AIR

CONNECTOR

CONDITIONER INTAKE FILTER

(UNDER SEAT)

Step 1. 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 ON position.

Step 2. 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 3. Check if crew cab heater/air conditioner fresh air fan assembly

is free from blockage.

If crew cab heater/air conditioner fresh air fan assembly

is blocked, clear blockage.

Step 4.

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 5. If problem still exists, notify Supervisor.

3-8