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 TM 10-3930-673-20-1
2
25. CAB HEATER DOES NOT HEAT CAB.
INITIAL SETUP
References
Tools and Special Tools
TM 10-3930-673-10
Tool Kit, General Mechanic's: Automotive
TM 9-4910-571-12&P
(Item 18, Appendix F)
Equipment Condition
Engine shut down (TM 10-3930-673-10)
Parking brake on (TM 10-3930-673-10)
Wheels chocked (TM 10-3930-673-10)
START
WARNING
1
KNOWN INFO
TEST OPTIONS
Read WARNING on
Temperature control adjusted to
Visual inspection.
following page.
heat cab.
REASON FOR QUESTION
Cab heater does not heat cab.
Is cab heater/air conditioner
This question eliminates possible
POSSIBLE PROBLEMS
problems and determines where
switch functioning (green
Light OFF, switch faulty.
troubleshooting continues.
switch light ON, blower
Control valve cable assembly
operating)?
faulty.
Engine water temperature low.
Control valve, hoses, or
connections faulty.
Heater obstructed or damaged.
Go to Electrical System
Troubleshooting
Fault 29, Heater does
NO
not operate and/or
Fault 31, Cab blower
does not operate.
YES
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