2003 Cab Air Filter Location

Just Bought This Truck. No Manuals Came With It. Where Is The Cab Air Filter Located.

Underneath the left hand side of the instrument panel is a cover for the HVAC module. Remove the cover. Then you will see a hinged door about 2" wide with a screw towards the bulkhead side of the door. Remove the screw, lower and unhinge the door and you will see the cab filters.