Toyota HIGHLANDER HYBRID 2009 Manual page 462

4-3. Do-it-yourself maintenance
STEP 5
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Replacement method
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Checking interval
Inspect and replace the air conditioning filter according to the maintenance
schedule. In dusty areas or areas with heavy traffic flow, replacement may
be required. (For scheduled maintenance information, please refer to the
"Scheduled Maintenance Guide" or "Owner's Manual Supplement".)
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If air flow from the vents decreases dramatically
The filter may be clogged. Check the filter and replace if necessary.
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Remove the filter cover.
Remove the air conditioning
filter and replace it with a new
one.
The "↑UP" marks shown on the
filter should be pointing up.