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TM 10-3930-643-20
BODY, CHASSIS AND HULL ACCESSORY ITEMS TROUBLESHOOTING AND MAINTENANCE.
13-1.
Accessory Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
a. HEATER FAN OPERATES BUT NO HEAT IS CIRCULATED.
Step 1.
Check coolant level.
If coolant level is low, refer to TM 10-3930-643-10.
Step 2.
Check temperature gage on instrument panel.
If gage indicates COLD, allow engine to warm up.
If normal operating temperature can not be obtained, replace thermostat,
refer to paragraph 4-29.
If gage indicates HOT, add coolant to radiator and check for leaks.
If gage indicates normal operating temperatures, go on to step 3.
Step 3.
Inspect all heater hoses.
If hoses are leaking, ruptured or broken,
replace,
r e f e r t o
paragraph 13-10.
b .
WIPER ASSEMBLY FAILS TO OPERATE PROPERLY.
Check to see if quick disconnect line has been disconnected.
If it is disconnected, connect it.
If it connected and still fails to operate, refer to paragraphs 13-6
and 13-7.
13-2
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