Engine Air Cleaner/Filter - GMC C-Series 2001 Owner's Manual

Engine Air Filter Restriction
Indicator (Diesel Engines)
Your engine has an indicator that lets you know when
the air filter is dirty and needs to be serviced. It is
located in the air intake tube below the air cleaner on the
passenger's side of the engine.
After the air filter is properly serviced, the indicator can
be reset by pushing the button on top of the indicator.
6-18
When the yellow indicator
reaches the red ring in the
sight glass, it's time to
service the air filter.

Engine Air Cleaner/Filter

Your GM Maintenance Schedule says when to replace
the air filter.
Gasoline Engine
R
Caterpillar
Diesel Engine