Cadillac 2003 DeVille Owner's Manual page 291

Follow these steps to reinstall the cover to the engine
air cleanedfilter housing:
1. Align the three tabs located on the back of the
cover with the three slots on the back of the
housing.
2. Push the cover slightly down and towards the
engine to engage the tabs in the slots and align the
two wing screws.
3. Engage and tighten the two wing screws on the top
of the engine air cleanedfilter housing cover.
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 cleaner/filter
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 cleanedfilter 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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