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Page Title:
CAB HEATER DOES NOT HEAT CAB - continued |
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 TM 10-3930-673-20-1
25. CAB HEATER DOES NOT HEAT CAB (CONT).
2
KNOWN INFO
TEST OPTIONS
Temperature control adjusted to
Visual inspection.
Is heater control valve cable
heat cab.
REASON FOR QUESTION
assembly correctly connected
Cab heater does not heat cab.
If control valve cable assembly
to control valve and
Light ON, switch OK.
faulty, valve will not operate
functioning?
POSSIBLE PROBLEMS
properly.
Control valve cable assembly
faulty.
Engine water temperature low.
Control valve, hoses, or
connections faulty.
Heater obstructed or damaged.
Replace faulty
NO
control valve cable
assembly.
YES
3
KNOWN INFO
TEST OPTIONS
Temperature control adjusted to
Visual inspection.
Is engine water temperature
heat cab.
REASON FOR QUESTION
within the normal (180 to
Cab heater does not heat cab.
If engine water temperature low,
210 degrees F) operating
Light ON, switch OK.
refer to Fault 12, Engine water
Control valve cable assembly OK.
range?
temperature below normal on
POSSIBLE PROBLEMS
Engine water temperature low.
Control valve, hoses, or
connections faulty.
Heater obstructed or damaged.
Refer to Fault 12,
Engine water
temperature below
NO
normal on
Page 2-678 to
correct fault.
YES
2-758
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