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The cabin air filter gets remarkably dirty over a year of use, even if your
car is garaged at night and not parked under trees. This dirt would
normally get blown over and collect on your A/C evaporator. This attracts
constant moisture and in some cars (Volvo for example) has been known to
lead to premature evaporator corrosion and leaks = $$$ replacement costs. I
keep the filter clean and change it regularly on my Volvo and change the
filters on my three Subies regularly as well. I make my own Subie filters
from high end 3M filters as has been described previously
car is garaged at night and not parked under trees. This dirt would
normally get blown over and collect on your A/C evaporator. This attracts
constant moisture and in some cars (Volvo for example) has been known to
lead to premature evaporator corrosion and leaks = $$$ replacement costs. I
keep the filter clean and change it regularly on my Volvo and change the
filters on my three Subies regularly as well. I make my own Subie filters
from high end 3M filters as has been described previously