Chevrolet 2005 Equinox Owner's Manual page 252

How to Inspect the Engine Air
Cleaner/Filter
To inspect the air cleaner/filter remove the filter from the
vehicle and lightly shake the filter to release loose
dust and dirt. If the filter remains caked with dirt, a new
filter is required.
5-18
To inspect or replace the engine air cleaner/filter, do the
following:
1. Turn off the engine.
2. Disconnect the air flow sensor electrical connector.