Chevrolet 2008 T Series Owner's Manual page 168

When to Inspect the Engine Air
Cleaner/Filter
The filter change indicator will let you know when the
filter should be replaced. If you are driving in dusty/dirty
conditions inspect the filter each oil change.
How to Inspect the Engine Air
Cleaner/Filter
Locate the filter change indicator, if equipped. When the
change indicator turns black or is in the red/orange
change zone, replace the filter and reset the indicator.
To inspect the 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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To inspect or replace the filter and reset the indicator, if
equipped, do the following:
1. Remove all three screws and carefully remove the
filter cover.
2. Inspect or replace the engine air cleaner/filter.
3. Be sure that all three screws are tightened securely
when reinstalling the filter cover.