TM 5-3805-262-20
3-24. ACCESSORIES TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
6. CAB HEATER FAN NOT OPERATING (Cont).
b. If 24 volts obtained,
turn ignition key switch to off position
and go to step 7 below.
Step 7.
Connect multimeter between HEATER FAN switch terminal to which white
wire connected and chassis.
Pull HEATER FAN switch knob completely out.
Turn ignition key switch to on position.
Multimeter shall indicate 24 volts.
a. If multimeter indicates 24 volts, replace heater fan motor (page
10-28) .
b. If multimeter does not indicate 24 volts, replace HEATER FAN
switch (page 10-48).
7. COLD AIR BLOWN FROM CAB HEATER.
Step 1. Check if engine is warm.
a. If engine is not warm, allow engine to warmup before turning
heater fan on.
b. If engine is warm, go to step 2 below.
Step 2. Remove engine side panels
Check that heater turnoff
(page 9-14).
valves are opened.
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