TM 9-2350-247-20-1VEHICLE COMPARTMENT HEATER MALFUNCTIONS 0085 00INITIAL SETUP:Maintenance LevelUnitTools and Special ToolsGeneral Mechanic’s Tool Kit (WP 0541 00, Item 57)Multimeter (WP 0541 00, Item 29)Slip Joint Pliers (WP 0541 00, Item 33)Personnel RequiredUnit MechanicReferencesSee your -10TM 9-2540-205-24&PEquipment ConditionEngine stopped (see your -10)Carrier blocked (see your -10)Heater HI-LO switch in LONOTEM548A1 and M548A3 troubleshooting procedures are the same even though componentlocations are different. When needed, locators are used to show the different componentlocations.The M548A3 has a fuel filter in between the fuel pump and the heater.T1. Press heater-on indicator cover lens.2. Does indicator light come on?YESNOGO TO BY (PAGE 0085 00-3)Y1. Release heater-on indicator.2. Move RUN-OFF-START switch to START.3. Does heater blower come on?YESNOGO TO CY (PAGE 0085 00-5)2Y1. Check if heater fuel pump comes on.2. Does heater fuel pump come on?YESNOGO TO EY (PAGE 0085 00-7)3Y1. Check on how many minutes it takes heater-on indicator to comeon.2. Does heater-on indicator come on in less than three minutes?YESNOGO TO GY (PAGE 0085 00-8)0085 00-1
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