Buick 2003 Regal Owner's Manual page 226

To check or replace the engine air cleaner/filter, do the
following:
1. Loosen the screw and clamp on the air duct.
2. Lift up on the two clips
located on the top of
the filter assembly.
3. Then disconnect the duct and reposition it while
4. Pull out the filter.
5. Replace the filter if needed.
6. Be sure to reinstall the filter and install the cover
removing the side cover.
tightly when you are finished.
Refer to the Maintenance Schedule to determine when
to replace the air filter.
See Part A: Scheduled Maintenance Services on
page 6-4.
Operating the engine with the air cleanedfilter
off can cause you or others to be burned. The
air cleaner not only cleans the air, it stops
flame if the engine backfires. If it isn't there
and the engine backfires, you could be burned.
Don't 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 cleanedfilter in place when
you're driving.
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