Buick 1993 Century Owner's Manual page 235

Air Cleaner
.-
If you have the 3300 V6 engine, your air cleaner is on the
driver's side of the engine compartment. To check or
replace the filter, release the latches and pull the air
cleaner open. Refer
to
the Maintenance Schedule
to
determine when to replace the air filter. See "Scheduled
Maintenance Services" in the Index.
I
Remove and replace the filter, then close the cover and
latches.