Chevrolet 2010 HHR Owner's Manual page 329

Because this operation can be a little difficult, you may
choose to have this done at the dealer/retailer service
department.
To inspect or replace the filter, do the following:
1. Disconnect the Mass Air Flow sensor, PCV hose,
and both ducts.
2. Pull the entire system from the top of the engine.
3. Turn the system over and place it on a soft,
non abrasive surface.
4. Remove the screws that hold the housing and
cover together and lift off the housing.
5. Inspect or replace the engine air cleaner/filter.
6. Reverse the steps to reinstall the system. Be sure
to reinstall the housing tightly.
6-26
How to Inspect the Engine Air
Cleaner/Filter (2.0L Engine Only)
See Engine Compartment Overview on page 6 16 for
the location of 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. Never use compressed air to clean the filter.
Because this operation can be a little difficult, you may
choose to have this done at the dealer/retailer service
department.