GMC 2007 Acadia Owner's Manual page 403

How to Inspect the Engine
Air Cleaner/Filter
To inspect the air cleaner/filter, remove the filter
from the vehicle and lightly shake the filter
(away from vehicle) to release loose dust and dirt.
If the filter remains caked with dirt, a new filter
is required.
To inspect or replace the engine air cleaner/filter,
do the following:
1. Loosen the screws that hold the cover on.
2. Disconnect the electrical connector.
3. Lift off the cover.
4. Remove the engine air cleaner/filter element
and any loose debris that may be found in the
air cleaner base.
5. Inspect or replace the air filter element.
6. Reverse Steps 1 through 3 to reinstall the
cover and reconnect the electrical connector.
CAUTION:
{
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 your engine, which will
damage it. Always have the air cleaner/filter
in place when you are driving.
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