GMC Duramax Diesel 2015 Owner's Manual page 95

10-16 Vehicle Care
Warning
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
helps to stop flames if the engine
backfires. Use caution when
working on the engine and do not
drive with the air cleaner/filter off.
Caution
If the air cleaner/filter is off, dirt
can easily get into the engine,
which could damage it. Always
have the air cleaner/filter in place
when you are driving.
Van Models
The air cleaner/filter assembly may
have an air cleaner/filter restriction
indicator that shows when the
engine air cleaner/filter is dirty and
needs to be serviced.
The air cleaner/filter restriction
indicator is on the air cleaner
resonator.
When to Inspect the Engine Air
Cleaner/Filter
See Maintenance Schedule on
page 11-3.
How to Inspect the Engine Air
Cleaner/Filter
When the restriction indicator is in
the red/orange change zone,
replace the filter and reset the
restriction indicator. The air cleaner/
filter assembly is at the front of the
engine compartment.
1. Cover Screws
2. Restriction Indicator