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 TM 10-3930-673-20-1
2
29. HEATER DOES NOT OPERATE.
INITIAL SETUP
Personnel Required
Tools and Special Tools
Two
Tool Kit, General Mechanics: Automotive
(Item 18, Appendix F)
References
STE/ICE-R (Item 17, Appendix F)
TM 10-3930-673-10
Multimeter, Digital (Item 9, Appendix F)
TM 9-4910-571-12&P
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
1
KNOWN INFO
TEST OPTIONS
Red light extinguished.
Visual Inspection.
Is red light illuminated on
Defrost fans OK.
STE/ICE-R #89.
heater/air conditioner switch?
POSSIBLE PROBLEMS
REASON FOR QUESTION
Wire 80 faulty.
This question eliminates possible
Heater/air conditioner switch faulty.
problems and determines where
troubleshooting continues.
Go to Step 2 of this
NO
fault.
YES
Go to Mechanical System Troubleshooting,
Fault 25, Cab heater does not heat cab.
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