2008 Lexus RX 400h Navigation Manual - Page 279

AIR CONDITIONING 3. Remove the filter from the filter case. 4. 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 installing the filter in the filter case, keep the arrow pointing up. Changing interval Inspect and replace the air conditioning filter according to the maintenance schedule. In dusty areas or areas with heavy traffic flow, early replacement may be required. (For scheduled maintenance information, please refer to the "Warranty and Services Guide/Owner's Manual Supplement/Scheduled Maintenance".) If air flow from the vents decreases dramatically The filter may be clogged. Check the filter and replace if necessary. INFORMATION The air conditioning filter should be installed properly in position. The use of air conditioning with the filter removed may cause deteriorated dustproof performance and then affect air conditioning performance. 299