Toyota 2003 Corolla Owner's Manual page 134

When inserting the filter in the filter
outlet, keep the arrow pointing up.
INFORMATION
The air filter should be installed prop-
erly in position. The use of air condi-
tioning with the air filter removed
may cause deteriorated dustproof per-
formance and then affect air condi-
tioning performance.
130
'03 Corolla U (L/O 0201)
2003 MY COROLLA_U (OM12744U)