Toyota 2009 Tundra Owner's Manual page 532

Replacement method
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Checking interval
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Inspect, clean and replace the air conditioning filter according to the mainte-
nance schedule. In dusty areas or areas with heavy traffic flow, more fre-
quent cleaning or 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
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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
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installed.
When cleaning the filter, do not clean the filter with water.
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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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