Lexus RX450H Manual page 547

4-3. Do-it-yourself maintenance
STEP 5

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, please refer to
the "Lexus Service Booklet" or "Lexus Warranty Booklet".)

If air flow from the vents decreases dramatically
The filter may be clogged. Check the filter and replace if necessary.
NOTICE

To prevent damage to the system
When using the air conditioning system, make sure that a filter is always
installed.
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RX450h_EE
Remove the air conditioning
filter and replace it with a
new one.
The "UP" mark shown on
the filter should be pointing
up.