TM 5-3805-281-24-1
Group 15
Diagnostic Information
DIAGNOSE ARCTIC/COLD WEATHER
HEATER MALFUNCTIONS
In the event of a malfunction, the following items should
be checked before performing the heater diagnostic
procedure:
Fuel supply
Fuses, electrical lines and connections.
Battery voltage.
Coolant flow.
Interference in the combustion air and exhaust pipes
If combustion is sooty, check the following:
combustion air and exhaust ducts. Clear if necessary.
Fuel metering pump. Measure for excessive delivery,
and replace if necessary.
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ARCTIC/COLD WEATHER HEATER
DIAGNOSTIC PROCEDURE
The heater system utilizes the green LED light located
next to the arctic/cold weather heater switch, located on
the right hand console inside the cab, to provide fault
information. The light provides different illumination
sequences depending on the malfunction as shown in the
function and fault test chart.
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