2011 Lexus RX 450h Owners Manual - Page 605

4-3. Do-it-yourself maintenance STEP 6 Remove the air conditioning filter and replace it with a new one. The "↑UP" mark shown on the filter should be pointing up. n Cleaning method If the filter is dirty, clean by blowing compressed air through the filter from the underside. Hold the air gun 2 in. (5 cm) from the filter and blow for approximately 2 minutes at 72 psi (500 kPa, 5.0 kgf/cm2 or bar). If an air gun is not available, have the filter cleaned by your Lexus dealer. n Checking interval Inspect, clean 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 "Owner's Manual Supplement" or "Scheduled Maintenance".) n If air flow from the vents decreases dramatically The filter may be clogged. Check the filter and replace if necessary. 524