Toyota Corolla 2010 Quick Reference Manual page 352

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Replacement method
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Checking interval
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".)
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If air flow from the vents decreases dramatically
The filter may be clogged. Check the filter and replace if necessary.
NOTICE
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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.
Remove the air conditioning
filter and replace it with a new
one.
The "↑UP" marks shown on
the filter should be pointing up.
I n f o r ma t i o n P r o v i d e d b y :
4-3. Do-it-yourself maintenance
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