2003 Chevrolet Express Van Owner's Manual - Page 263

Check the indicator again after your vehicle has been driven. If the area inside the indicator is orange and CHANGE AIR FILTER appears, the filter should be replaced. To replace the engine air cleaner/filter, do the following: 1. Unhook the retainer clips and remove the cover. 2. Lift the filter out of the engine air cleaner/filter housing. Care should be taken to dislodge as little dirt as possible. Refer to the maintenance schedule to determine when to replace the engine air cleaner/filter. See Part A: Scheduled Maintenance Services on page 6-4. 3. Clean the engine air cleanedfilter housing. 4. Install the new engine air cleanedfilter into the engine air cleaner/filter housing. Make sure that it fits properly into the housing. 5. Install the cover and fasten the retaining clips. Operating the engine with the air cleanedfilter off can cause you or others to beburned. The air cleaner not only cleans the air, it stops flame if the engine backfires. If it isn't there and the engine backfires, you could be burned. Don't drive with it off, and be careful working on the engine with the air cleanedfilter off. 6. After the engine air cleanedfilter is properly serviced, the indicator should be reset. Push the button on the top of the indicator to reset it to the green (clean) filter zone. Notice: If the air cleaner/filter is off, a backfire can cause a damaging enginefire. And, dirt can easily get into your engine, which will damage it. Always have the air cleaner/filterin place when you're driving. See Normal Maintenance Replacement Parts on page 5-104 for the proper filter to use. 5-20