Subaru 2004 Legacy - Manual (Page 200)

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Climate control
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Air filtration system (if equipped)
If your vehicle’s air conditioning system is equipped
with a optional air filtration system, replace the filter el-
ement according to the replacement schedule shown
below. This schedule should be followed to maintain
the filter’s dust collection ability. Under extremely
dusty conditions, the filter should be replaced more
frequently. Since the filter element is a viscous type, it
is unnecessary to clean or wash the element. Have
your filter checked or replaced by your SUBARU deal-
er.
Replacement schedule:
Every 12 months or 9,300 miles (15,000 km) whichev-
er comes first
NOTE
The filter can influence the air conditioning, heat-
ing and defroster performance if not properly
maintained.