GMC 2004 Sierra - Manual (Page 423)

Engine Air Cleaner/Filter
See Engine Compartment
Overview on page 5-12 for
location of engine air
cleaner/filter and change
indicator (if equipped).
When to Inspect
If your vehicle is equipped with a filter change indicator
it lets you know when the filter needs to be replaced.
Vehicles with a restriction indicator, inspect the air
cleaner/filter at every oil change and replace the filter
when the indicator tells you to. Vehicles without a
change indicator, inspect the air cleaner/filter at every
oil change and replace it at the first oil change after
25,000 miles (40 000 km).
How to Inspect
Locate the filter change indicator. 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 filter to release loose dust and
dirt. If the filter remains “caked” with dirt, a new filter
is required.
To inspect and replace the filter and reset the indicator
(if equipped), do the following:
The air cleaner/filter assembly is located on the front
corner of the engine compartment on the passenger’s
side of the vehicle.
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