I am replaceing cabin air filter,Replaced one removeing one screw and filter falling down but box came with two.Am I missing one that needs to be replaced?

The air filter may be a slide in type just above the fan motor and it may have 2 screws to gold it in place . Check with a workshop manual

Your cabin filter is located behind the glove box.
First you will need to remove the glove box. Open the glove box, and on the left and right side on the inside, there will be a retainer that you will need to pull out. This will cause your glove box to fall forward, exposing all of the screws. Unscrew the 10 screws around the outer edge of the glove box, and pull the unit down and out of your way.
After the glove box is removed, you will be able to see the HVAC casing. You will see the access door to the cabin filter, held in with some clips. Disconnect the resistor connector that is in your way, then remove the four clips in order to access the filters.
Once you pull the filters out, you can install the new ones in reverse order. Make sure that the arrows on the filters are pointing up, and that the door is sealed properly when you close it back up.
Good luck and please let me know if I may further assist you. -TXTEXAN

Your cabin filter is hiding above/behind your glove box. In order to access the cabin filter, first remove the passenger instrument panel side cover. Next, open your glove box and there should be one clip on the left and right side of the glove box... remove those clips as well as the tether that is holding the glove box up. After the glove box falls forward, remove the upper storage box. You should now see the cabin filter access panel, which is held in with 5 or 6 screws. Remove the screws, pull the access panel out, and you should see the cabin filter. Reverse instructions for installation.
Please let me know if I may further assist you. -TXTEXAN

If you are talking about the cabin air filter, this filters the outside air for the HVAC.
Hastings Filter (#AF1057) shows one for the 97-03 MY trucks.

Remove the screws that hold the horizontal filter housing cover from behind the glove box (no need to open the glove box);

Pull the cabin filter straight down (sits vertical behind the glove box inside the housing).

Install replacement and reattach the cover.

On the VW Jetta MkV, the cabin filter is underneath the glove box. Access is gained by removing two plastic screws, gently pulling down a piece of foam insulation, and releasing a single clip to detach the filter. It (and some debris from it) fall easily onto the floor mat below. Insert the new cabin filter, replace the insulation, re-screw the screws, and within 3 minutes, you're back in business with fresh air and clean hands besides!

cabin filter is located behind glove box. open glove box and remove the 2 side rubber catchers and let fall down. you will see 4 tabs, 2 on each side of rectangular box. press them and pull out the tray and your cabin filter is in the tray

Per Hondacarforum.com

"look for your air filter box. its a big square box on the right hand side of the car under the hood. you cant miss it. ther should either be clips or screws holding the box together. you have to get the top off of it to get to the filter... just replace the filter, and put the top back on and ur good"
per Chinogang Senior Member

Filter is located behind the glove box. All you need is a screwdriver to replace.

1. Open the glove box and empty to take the weight off the box.

2. On the right side there is a plastic hinge like device held on by one Phillips head screw. If you have trouble removing with a Phillips screwdriver you can remove with a narrow flat head screwdriver. Remove the screw and slide hinge off the mount.

3. To drop the glove box press the sides slightly inwards while 'forcing' it open beyond it's normal stopping point. Careful as when it releases it will fall wide open and may even fall from its hinged area. Set it aside.

4. Behind the glove box there is probably some fiberous material inserted to prevent noise like squeaking when it rubs. It is sticky on one side to hold it in place. Just remove and place out of the way.

5. Behind the fiberous material there'll be a cover which kinda looks like a grille. Mine was white and it is in the center of the opening. Remove it by releasing the clips at the left or right. It comes right out.

6. When the cover comes off slide the filter out and replace it. The filter lays flat and just slides in and out easily. However, if it has been some time since you replaced be prepared for a lot of debris on top of the filter such as leaves, grass or other general type of debris that has been sucked into the filter. It also may be the source of any bad odors that you smell through the air conditioning system.

7. Reverse the process. Replace the cover and push the glove box lid back into place. When you replace the glove box be careful to make sure the hinge you initiallly removed the screw from is not left behind the glove box or you will have to remove again to get it out. Replace the screw and do not over tighten as it screws into plastic and then your done.

Hi, this cabin filter is not the air filter, this is the A/C filter located behind the glovebox, remove a couple of screws and a bigger nutt, and the filter is located in a vertical box.

Open the glove box

Remove all of the contents in the glove box

On the right side, dis-engage the rod going to the split plastic pin on the glove box door

Squeeze both other sides of the glove box to defeat the stops that keeps the glove box from falling open

Observe the box in the area vacated by letting the glove box drop down, this is the heater box

Locate a rectangular cover (approx 7 " x 2"), it is located on the face of the box; facing you.

Pull this cover out towards you, the cabin air filter is located in the tray that is connected to this rectangular cover.

This should help you replace it.