1998 Lexus LS 400 Owners Manual - Page 187

AIR CONDITIONING AND AUDIO 21L011 2. Take out the air filter. Inspect the lower surface of the filter. If it is just moderately dusty, it may be cleaned by blowing compressed air from the lower surface. Do not wash or oil the filter. If it is dirty, it should be replaced. To maintain the air conditioning efficiency, replace the air filter according to the maintenance schedule. (For scheduled maintenance information, please refer to the separate "Owner 's Manual Supplement/Maintenance Schedule".) (d) Operating tips D Make sure the air inlet grilles in front of the windshield are not blocked by leaves or other obstructions. D If air flow control is not satisfactory, check the dashboard vents. (See "Center vents", "Side vents", "Lower vent" and "Rear vents".) D To help cool down the interior after parking in the hot sun, drive for the first few minutes with the windows open. After the excess heat has blown away, close the windows. D When driving on dusty roads, close all windows. If dust thrown up by the vehicle is still drawn into the vehicle after closing the windows, it is recommended that the air intake control button be left to the OUTSIDE AIR mode and the fan speed control button be pressed to anywhere except the "OFF" button. D If following another vehicle on a dusty road, or driving in windy and dusty conditions, it is recommended that the air intake control button be temporarily pressed in to the RECIRCULATED AIR mode, which will close off the outside passage and prevent outside air and dust from entering the vehicle interior. NOTICE Do not drive with the air filter removed, or the efficiency of air conditioning may be lost. 187