2006 Hummer H2 Owner's Manual - Page 350
2006 Hummer H2 Manual
Page 350 highlights
How to Inspect the Engine Air Cleaner/Filter Vehicles With an Air Filter Restriction Indicator Locate the air filter restriction indicator on the engine air duct. When the indicator turns black or is in the red/orange change zone, replace the filter and reset the indicator. See "Inspecting the Engine Air Cleaner/Filter and Resetting the Air Filter Restriction Indicator" later in this section for further instructions. Inspecting the Engine Air Cleaner/Filter and Resetting the Air Filter Restriction Indicator Vehicles Without an Air Filter Restriction Indicator To inspect the air cleaner/filter, remove it from the vehicle and lightly shake the filter to release loose dust and dirt. If the engine air cleaner/filter remains caked with dirt, a new filter is required. See "Inspecting the Engine Air Cleaner/Filter and Resetting the Air Filter Restriction Indicator" later in this section for further instructions. 1. Loosen the screws on the engine air cleaner/filter cover. 5-20