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TM 9-2320-285-24-1
2-68.
HEATERS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3.
CAB HEATER DOESN'T HEAT CAB (Cont)
Step 4.
Remove temperature valve (para 2-73a).
Inspect temperature valve for cracks or damage.
a.
If temperature valve is cracked or damaged, replace (para 2-73a).
b.
If temperature valve is not cracked or damaged, go to step 5 below.
Step 5.
heck cab heater hoses and clamps for leaks, obstructions, or loose connections.
WARNING
Compressed air must not exceed 30 psi. Wear safety glasses when using compressed air.
Failure to do so could cause serious injury to eyes and possible blindness. If you hurt your
eyes or if a foreign object is blown into your eyes, seek medical aid immediately.
a.
If connections are loose, tighten clamps; if hoses are leaking,
replace (para 2-73a); if hoses are obstructed, clean using
compressed air (30 psi maximum).
b.
If hoses are not leaking or obstructed, and connections are
tight, notify direct support maintenance.
4.
WINDSHIELD WILL NOT DEFROST
Step 1.
Check if defroster control is pulled out fully.
a.
If defroster control is not pulled out fully, pull out fully to
open distributor door (directs air through windshield defroster
vents).
b.
If defroster control is pulled out fully, go to step 2 below.
Step 2.
Check windshield defroster vents for obstructions.
a.
If obstructions are found, remove.
b.
If obstructions are not found, go to step 3 below.
2-764

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