Lexus 2003 LS Owner's Manual page 208

AIR CONDITIONING
(c) Air conditioning filter
If the "CHANGE A/C FILTER" appears on the
multi–information display, change the air conditioning filter as
soon as possible because the air filter might have clogged.
The filter may clog after long use which will reduce the air flow.
1. When you replace the filter, be sure to turn off the fan.
21L161b

1 Cover
2. Open the glove box and remove the cover.
194
21L162a

1 Filter cover
2 Levers
3. Push up the levers and remove the filter cover.
21L163a

1 Filter case
4. Pull the filter case toward you.