2005 Toyota Highlander Owners Manual - Page 264

'05 HIGHLANDER_U (L/O 0409) 5. Remove case. the filter from the filter 6. Inspect the filter on the surface. If it is dirty, it should be replaced. When installing the filter and filter case, keep the arrow pointing up. 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. 264 2005 HIGHLANDER from Nov. '04 Prod. (OM48570U)