2009 Lexus GS 450h Owners Manual - Page 530

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 filter with water. 4 Maintenance and care 471 GS_HV_U (OM30B44U) March 8, 2010 10:03 am