The interior ventilation filter is placed within a panel located in the engine compartment on the right (or passenger) side. To depivot it you need to loosen the clips used to secure the cover, the cover itself, then remove a ventilation filter element. To install, do the Removal process in the opposite way. Other models have charcoal air filtering elements installed in the air conditioning, which are built in a housing under the right side of the instrument panel. Removal of lower dash trim under glove compartment will give access to these filters. After that, slide the filter door on the bottom of the heater box towards the seat and take out both charcoal filters. The opposite of the removal is how it is installed.