GMC 2003 Savana Van Owner's Manual page 262

Engine Air Cleaner/Filter Your vehicle may have this
feature. The engine air
cleaner/filter assembly has
an indicator that lets
you know when the air
filter
is
dirty and needs to
be serviced.
If the area inside the clear section of the indicator is
green, no air filter service is required. When the
area inside the indicator is orange and CHANGE AIR
FILTER appears, press the button to reset.
The engine air cleaner/filter is located near the center of
the engine compartment. See Engine Compartment
Overview on page 5-72 for more information on location.
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