GMC 1996 Jimmy Owner's Manual page 260

Air Cleaner
To remove the air cleaner, remove the wing nuts that hold
the cover on. Remove the cover and lift out the air filter.
Insert a new air filter, then replace the air cleaner cover.
Tighten the wing nuts to hold the cover in place.
Refer to the Maintenance Schedule to determine when to
replace the air filter.
See "Scheduled Maintenance Services" in the Index.
Operating the engine with the air cleaner 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 off.
I
NOTICE:
If the air cleaner 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 in place when you're driving.
6-13