2009 Lexus ES 350 Navigation Manual - Page 254

AIR CONDITIONING Checking interval Inspect, clean and replace the air conditioning filter according to the maintenance schedule. In dusty areas or areas with heavy traffic flow, more frequent cleaning or, 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. NOTICE D To prevent damage to the system D When using the air conditioning system, make sure that a filter is always installed. D When cleaning the filter, do not clean the filter with water. 274