2007 Toyota Highlander Navigation Manual - Page 167
2007 Toyota Highlander Manual
Page 167 highlights
AIR CONDITIONING 5. Remove the filter from the filter case. 6. Inspect the filter on the surface. If it is dirty, it should be replaced. 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. 167