2008 Toyota 4Runner Owners Manual - Page 344

07 12.25 INFORMATION The air filter should be installed properly in position. The use of air conditioning with the air filter removed may cause deteriorated dustproof performance and then affect air conditioning performance. CY18022 4. Remove case. the filter from the filter 5. Inspect the filter on the surface. If it is the just moderately dusty, it may be cleaned by blowing compressed air from the reverse surface. Do not wash or oil the filter. If it is dirty, it should be replaced. When setting the filter to the filter case, ensure that the flat side of the filter is down and the ribbed side is up. Position the filter case so that the "↑UP" mark is pointing up and install it in the vehicle. 302