2007 Lexus GS 350 Owners Manual - Page 482

4-3. Do-it-yourself maintenance n Checking 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, refer to the "Warranty and Services Guide/Owner's Manual Supplement/Scheduled Maintenance".) n If air flow from the vents decreases dramatically The filter may be clogged. Check the filter and replace if necessary. NOTICE n To prevent damage to the system l When using the air conditioning system, make sure that a filter is always installed. l When cleaning the filter, do not clean the with water. 408