Chevrolet 2009 Kodiak Owner's Manual page 241

When to Inspect the Engine Air
Cleaner/Filters
For vehicle with this feature, the engine air filter life
gage will be located in the engine compartment either
on or near the air cleaner or above the switchbank in the
center of the instrument panel. It monitors the engine
air filter and indicates when the filter should be replaced.
If driving in dusty/dirty conditions, inspect the filter
each oil change.
As the filter gets dirty, the yellow indicator begins to
rise. When it reaches the red/orange change area,
replace the filter. Reset the indicator after each filter
replacement, refer to Air Filter Restriction Indicator
on page 3-46.
How to Inspect the Engine Air
Cleaner/Filter (Duramax Diesel
6.6L Engine)
CAUTION:
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Operating the engine with the air cleaner/filter off
can cause you or others to be burned. The air
cleaner not only cleans the air; it helps to stop
flames if the engine backfires. If it is not there and
the engine backfires, you could be burned. Do not
drive with it off, and be careful working on the
engine with the air cleaner/filter off.
Notice: If the air cleaner/filter is off, a backfire can
cause a damaging engine fire. And, dirt can easily get
into the engine, which will damage it. Always have
the air cleaner/filter in place when you are driving.
The engine air cleaner/filter is located in the center of
the engine compartment.
To inspect the engine air cleaner/filter, remove the filter
from the vehicle and lightly shake the filter to release
loose dust and dirt. If the filter remains caked with dirt,
a new filter is required.
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