Toyota Matrix 2009 Owner's Manual page 252

Replacement method
n
Checking interval
n
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 "Scheduled Maintenance Guide" or "Owner's Manual Supplement".)
If air flow from the vents decreases dramatically
n
The filter may be clogged. Check the filter and replace if necessary.
NOTICE
n When using the air conditioning system
Make sure that a filter is always installed.
Using the air conditioning system without a filter may cause damage to the
system.
4-3. Do-it-yourself maintenance
Remove the air conditioning
filter and replace it with a new
one.
The "↑UP" marks shown on
the filter should be pointing up.
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