2003 Toyota Corolla Owners Manual - Page 130

'03 Corolla U (L/O 0201) When inserting the filter in the filter outlet, 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. 130 2003 MY COROLLA_U (OM12744U)