Quantcast 49.  HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS

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VERIFY REPAIR - TM-9-2320-364-20-2_809
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TM-9-2320-364-20-2 Truck Tractor Line Haul 52 000 GVWR 6x4 M915A2 Truck Tractor Light Equipment Transporter (Let) Manual
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OPERATION TEST - TM-9-2320-364-20-2_811
TM 9-2320-364-20-2 2-1586 49.  HEATER DOES NOT OPERATE OR WILL NOT CHANGE SPEEDS. INITIAL SETUP 1. Go to Step 5 of this Fault. START YES NO Cooling fan operation normal   indicating 24 vdc supplied to   EPAC from CB15. FAN control switch faulty. Heater wire harness faulty. Heater resistor faulty. Wire 1082 faulty. Rectifier M81 faulty. Wire 1082 faulty. Orange wire faulty. Heater ground faulty. Heater motor faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Audible inspection. If heater operates at only one speed, fault is in FAN control switch, heater resistor, or wire harness. 2-20.  ELECTRICAL SYSTEM TROUBLESHOOTING (CONT). Tools and Special Tools Tool Kit, General Mechanic’s:  Automotive (Item 74, Appendix G) STE/ICE-R (optional) (Item 3, Appendix G) Multimeter (Item 44, Appendix G) Equipment Condition Engine OFF, (TM 9-2320-364-10) Parking brake applied, (TM 9-2320-364-10) Wheels chocked, (TM 9-2320-364-10) References TM 9-2320-364-10 TM 9-4910-571-12&P Materials/Parts Lockwasher (6) (Item 182, Appendix F) Does heater operate at least at one speed? WARNING Read   WARNING on Page 2-1587

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