TM 9-2350-247-20-1
VEHICLE COMPARTMENT HEATER MALFUNCTIONS
0085 00
INITIAL SETUP:
Maintenance Level
Unit
Tools and Special Tools
General Mechanic’s Tool Kit (WP 0541 00, Item 57)
Multimeter (WP 0541 00, Item 29)
Slip Joint Pliers (WP 0541 00, Item 33)
Personnel Required
Unit Mechanic
References
See your -10
TM 9-2540-205-24&P
Equipment Condition
Engine stopped (see your -10)
Carrier blocked (see your -10)
Heater HI-LO switch in LO
NOTE
M548A1 and M548A3 troubleshooting procedures are the same even though component
locations are different. When needed, locators are used to show the different component
locations.
The M548A3 has a fuel filter in between the fuel pump and the heater.
T
1. Press heater-on indicator cover lens.
2. Does indicator light come on?
YES
NO
GO TO BY (PAGE 0085 00-3)
Y
1. Release heater-on indicator.
2. Move RUN-OFF-START switch to START.
3. Does heater blower come on?
YES
NO
GO TO CY (PAGE 0085 00-5)
2Y
1. Check if heater fuel pump comes on.
2. Does heater fuel pump come on?
YES
NO
GO TO EY (PAGE 0085 00-7)
3Y
1. Check on how many minutes it takes heater-on indicator to come
on.
2. Does heater-on indicator come on in less than three minutes?
YES
NO
GO TO GY (PAGE 0085 00-8)
0085 00-1
