Chevrolet 2009 Cobalt Owner's Manual page 280

How to Inspect the Engine Air
Cleaner/Filter
CAUTION:
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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. If it is not there and
the engine backfires, you could be burned. Do not
drive with it off, and be careful working on the
engine with the air cleaner/filter off.
Notice: If the air cleaner/filter is off, a backfire can
cause a damaging engine fire. And, dirt can
easily get into the engine, which will damage it.
Always have the air cleaner/filter in place when you
are driving.
5-22
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. Never use compressed air to clean
the filter.
To inspect or replace the engine air cleaner/filter,
1. Turn off the engine.
2. Disconnect the air flow sensor electrical connector.
3. Loosen the screws on the clamps holding the air
outlet duct in place. Do not remove the clamps.
4. Remove the air outlet duct.