2. Locate the cabin air filter housing. In the 2004 Toyota Tundra, it's located behind the glove box.
3. Open the glove box and remove the contents.
4. On the right side of the glove box opening, there is a plastic cover held in place by two Phillips-head screws. Remove these screws and the cover.
5. Behind the cover, you'll see the cabin air filter housing. It's a rectangular plastic box with a black or gray cover.
6. Open the cabin air filter housing by removing the two Phillips-head screws on the cover.
7. Slide out the old cabin air filter. It's a rectangular, pleated paper filter.
8. Vacuum up any debris inside the cabin air filter housing.
9. Insert the new cabin air filter into the housing, making sure that the arrows on the filter point toward the front of the vehicle.
10. Replace the cover of the cabin air filter housing and secure it with the two Phillips-head screws.
11. Replace the cover on the right side of the glove box opening and secure it with the two Phillips-head screws.
12. Close the glove box and you're done!
