I have an 2009 nissan and I am looking to take the glove box apart; does it just split at the seems or is it one solid peice?

Look in the owner's manual in the glove box to find out.
If you glove box has no manual, call a Nissan dealer and ask them.
If you have no dealer, go to a car sales lot and find a 2002 Sentra and ask to look at the book in the glove box, politely.
God bless your efforts.

2008 Altima2.5S Trunk wont open GRRRRRR - Nissan Forums : Nissan Forum

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take to a mechanic

Look in owners manual.

Here's a really wild guess.
My daughter has a '06 Murano and the air filter, called the "cabin filter" is behind the glove box!
I'm supposing you have no owner's manual to look it up, right?
I have changed hers twice already.
You remove the glove box cardboard liner very carefully and you will see a door that can opened that has the filter behind it.
Seems like Nissan wanted 30 or 40 dollars, and I got one from e-bay for 6.
Be blessed.

If you are quite comfortable working on cars you can do this. The in cabin air filter is accessed through the glove box opening after removal of the glove box.
There is a small panel covering the right hand side of the glove box which will pop off if you pry lightly with a standard screwdriver
Then there are eight philips head screws which must be removed. Three are at the bottom of the glove box, three more are inside on the top and two are located inside at the rear top of the glove box. Once these are removed and the glove box is pulled out the filter is accessible, but not very easily seen.
It is located on the far left side and covered by a black plastic cover. You can reach in and push up lightly on the plastic cover removing it.
The opening is smaller than the filter and that makes removal and replacement difficult, but the filter is flexible and the pull tab can be used to extract the old filter. The new one can be squeezed and pushed into place with the air direction arrow towards you (the same orientation as the one removed). Replace the plastic cover and reinstall the glovebox by installing the eight screws and the side cover.Thanks for choosing Fixya, RJ

Read more: http://wiki.answers.com/Q/How_do_you_replace_cabin_filter_for_2009_nissan_maxima#ixzz1MYGWxc6K

Most cabin air filters are located inside the dash. Only way to access this area is through the glove box. Open glove box, remove/open the tabs and the glove box cover will drop down to gain access. Be sure to remove all items from the box or they will just dump out on floor. Behind the glove box using a flashlight you will see the filter, remove, replacement is reverse of accessing.

Hope this helps!
Chip

you shouldn't need any tools but empty your glove box. there's 2 pins on the hinge side of the glove box. slide those out and carefully drop the glove box down. you will see the filter door. simply open and replace and put back.

the first time may take some time but it's pretty easy and the second time you should be able to do start to finish within 5 min

That's because it is!
Once you have the heater box assembly out of the vehicle, you will be able to split the two halves apart by removing the screws, to gain access to where the heater core is located. If you have A/C, it will be a major PITA. Good Luck!

I just spent my whole day with the same problem and it looks as if alot of other people have too. You need to replace the control valve. Take your glove box out, then take your center console peice out. Then you have to take the passenger side plastic off. This is the peice that surrounds the glove box. Once you have done this if you look underneath the dash towards the center console you will see a little box with an arm on it that goes down to an aluminium hose. That little box with the arm is the control valve.