Lexus CT200h Owner's Manual page 528

4-3. Do-it-yourself maintenance

Checking interval
Inspect, clean and replace the air conditioning filter according to the mainte-
nance 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.

When cleaning the filter, do not clean with water.
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