2008 Chevrolet HHR Owner's Manual - Page 276

How to Inspect the Engine Air Cleaner/Filter (2.0L Engine Only) To inspect or replace the filter, do the following: 1. Remove the screws that hold the housing and cover together and lift off the cover. 2. Inspect or replace the engine air cleaner/filter. 3. Reverse the steps to reinstall the system. Be sure to reinstall the housing tightly. {CAUTION: 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 your engine, which will damage it. Always have the air cleaner/filter in place when you are driving. See Engine Compartment Overview on page 5-12 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. 5-22