Re: cabin air filter for a 03 navigator
Most filters are accessible through an access panel in the HVAC housing, which may be under the hood or in the interior of the car. Some filters require basic hand tools to remove and install the filter; others just require your hands. Should be an example in your owners manual and should be easy to replace. Check the plastic cover under the windshield or the duct work under the hood.
I love it when people do things right
Unfortunetly I dont always do that lol