Chevrolet Optra 2005 Owner's Manual page 133

To change the passenger compartment air filter, use the
following steps:
Sedan shown, Hatchback similar
1. Remove the four screws from the filter cover
located below the glove box.
2. Remove the filter cover.
3. Remove the old passenger compartment air filter.
4. Then reverse the steps to install the new air filter.
Ensure that the new filter is inserted to the correct
air flow.
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