TM 5-3805-261-20
BODY, CHASSIS AND HULL ACCESSORY ITEMS TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
f.
BOTH HEATER FANS FAIL TO OPERATE.
Reset circuit breaker (Figure 14-1).
Figure 14-1.
Step 2.
Check fuse number 20A.
If fuse is blown--replace. Refer to paragraph 7-63.
Step 3.
Test the continuity of the heater wiring harness between the two heater motors. Refer to Wiring
Harness Troubleshooting, paragraphs 7-114 and 7-115 for continuity test procedures.
If heater wiring harness is damaged or defective--replace. Refer to paragraph 7-114.
g.
ONE HEATER FAN FAILS TO OPERATE.
Step 1.
Check heater motor.
If the motor is damaged or defective--replace. Refer to paragraph 14-9.
Step 2.
Test the continuity of the heat switch. Refer to Wiring Harness Troubleshooting, paragraphs 7-114
and 7-115 for continuity test procedure.
If the switch is damaged or defective--replace. Refer to paragraph 4-9.
Step 3.
Test the continuity of the heater wiring harness between the heater motor and heater switch. Refer
to Wiring Harness Troubleshooting, paragraphs 7-114 and 7-115 for continuity test procedure.
If heater wiring harness is damaged or defective--replace. Refer to paragraph 7-114.
14-5
