2002 GMC Savana Van Owner's Manual - Page 284

Engine Air Cleaner/Filter (Gasoline Engines) The engine air cleaner/filter assembly has an indicator that lets you know when the air filter is dirty and needs to be serviced. See "Owner Checks and Services" in the Index to determine when to check the indicator. The engine air cleaner/filter is located near the center of the engine compartment. See "Engine Compartment Overview" in the Index for more information on location. If the area inside the clear section of the indicator is green, no air filter service is required. When the area inside the indicator is orange and CHANGE AIR FILTER appears, the filter should be replaced. 6-17