Lexus GS 450h 2008 Owner's Manual page 455

Checking interval
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Inspect and replace the air conditioning filter according to the maintenance sched-
ule. In dusty areas or areas with heavy traffic flow, early replacement may be
required. (For scheduled maintenance information, refer to the "Warranty and Ser-
vices Guide/Owner' s Manual Supplement/Scheduled Maintenance".)
If air flow from the vents decreases dramatically
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The filter may be clogged. Check the filter and replace if necessary.
NOTICE
To prevent damage to the system
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When using the air conditioning system, make sure that a filter is always installed.
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When cleaning the filter, do not clean the filter with water.
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4-3. Do-it-yourself maintenance
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