In the event of a malfunction, the following items should
be checked before performing the heater diagnostic
Fuses, electrical lines and connections.
If combustion is sooty, check the following:
Fuel metering pump. Measure for excessive delivery,
and replace if necessary.
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
sequences depending on the malfunction as shown in the
function and fault test chart.
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