Table 2-3. Mechanical Troubleshooting (Cont)
TEST OR INSPECTION
Diesel fuel is flammable. When disconnecting fuel lines to test fuel flow,
direct fuel spray away from source of ignition. A fire extinguisher must be
on hand in work area. Failure to follow this warning may result in serious
injury or death to personnel.
If troubleshooting cargo compartment heater malfunction, remove heater cover.
Disconnect fuel line from inlet side of heater. Place a suitable container under inlet
line. Check for fuel flow to heater while holding run-start switch in START position
(all except engine coolant heater) or on-off switch in ON position (engine coolant
If fuel flow is evident, replace heater, (See paragraph 11-8 or 11-21)
If fuel flow is not evident, perform step 4.
Check for restrictions in heater inlet fuel line.
If line is restricted, clear restrictions.
Perform Electrical Troubleshooting malfunction #22.
HEATER (ENGINE COOLANT ONLY)
38. FAN RUNS CONTINUALLY WITH SWITCH OFF; RUN LAMP STAYS ON; NO HEAT PRODUCED
Replace heater. (See paragraph 11-16)
39. HEATER OPERATES; ENGINE REMAINS COLD
Check to see if coolant shutoff valves are open.
40. WILL NOT START
heater. (See paragraph 11-16)
Electrical Troubleshooting malfunction #22.