GMC 1996 Sierra Owner's Manual page 268

Install the new filter by pushing it all the way to the stop
on the duct.
Install the duct and the filter into the air cleaner housing.
Make sure that the duct fits properly into the housing.
Install the cover and fasten the two retaining clips.
After the air filter
is
properly serviced, the indicator
should be reset. Push the button on top of the indicator
to reset it to the green (clean) filter zone.
Refer to the Maintenance Schedule to determine when to
replace the air filter.
See "Scheduled Maintenance Services" in the Index.
I
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.
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