TM 5-3805-261-20
BODY, CHASSIS AND HULL ACCESSORY ITEMS TROUBLESHOOTING AND MAINTENANCE PROCEDURES.
(cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
d.
FRONT OR REAR WINDOW DEFROSTER DOES NOT OPERATE. (cont)
Step 2.
Check fuse number 10A.
If fuse is blown--replace. Refer to paragraph 7-63.
Step 3.
Check the defroster motor.
If the defroster motor is damaged or defective--replace. Refer to paragraph 14-8.
Step 4.
Test the continuity of the defroster switch. Refer to Wiring Harness Troubleshooting, paragraphs 7-
114 and 7-115 for continuity test procedure.
Step 5.
Test the continuity of the harness between the defroster motor and defroster switch. Refer to
Wiring Harness Troubleshooting, paragraphs 7-114 and 7-115 for continuity test procedure.
e.
HEATER FANS AND CONTROLS OPERATE, BUT NO HEAT.
Step 1.
Check hoses and connections to heater coil.
If hose clamps are loose--tighten. If hose is damaged or defective-- replace. Refer to paragraph 14-9.
Step 2.
Check control valve assembly.
If the control valve assembly is damaged or defective--replace. Refer to paragraph 14-9.
Step 3.
Check heater coil.
If the coil is blocked, damaged or defective--replace. Refer to paragraph 14-9.
f.
BOTH HEATER FANS FAIL TO OPERATE.
Step 1.
Check circuit breaker number 60A.
14-4
