Does the 2009 galant have a cabin air filter - 2006 Mitsubishi Galant

2008 - 2012 models should have the access panel behind the glove box if the van is equipped with a filter. Not all models have a filter.
You drop the glove box down by disconnecting the support straps.

I assume you mean the cabin air filter. The engine air filter is easy, assuming you've changed one on any other car before (hint: it's a box with some clips on the right side). The cabin air filter is a bit more involved, see below.

Cabin air filter (with pics):
Thread Cabin filter change

Cabin air filters were not available on 2008 and 2009 models.

it will be in that tightly sealed box

2009 chevy traverse- where is the cabin air filter located. It definatly has one but ??? where.

Below is a great video demonstrating the replacement of your cabin filter.

cabin air filter is either behind glove box or on passenger side of windage tray, under the plastic cover where the windsheid wiper arms come out. yes you can if the vehicle is actually equiped with one, sometimes they arent,even though parts retailer show that they are.

Open the glove box and empty the contents. gently push the glove box to the left and slide the stop toward you. Now slide the box to the right to get the left stop unhooked. Letting the glove box hang, look at the long thin plate on the fan shroud and undo the two screws holding it in. Now you can slide the cabin filter tray out of the fan shroud and replace the paper element. If you look at the fan shroud and see the rectangular slot but there are no screws in it , the cabin air filter has not been installed in your model. The rectangle can be cut out with an Exacto knife and the cabin air filter can be installed in the slot. You can purchase the cabin air filter tray, cabin air filter, and mounting screws at the Misubishi dealer. I purchased one out of an Eclipse at a salvage yard for $5 , washed it, and installed a new $10 dollar aftermarket paper element. I no longer have dust on my dash and it only cost $15.

The cabin air filter should be behind the glovebox

There should be a cabin filter. Call the parts store to see if they stock one for your car in particular.

Cabin filters are located in stream of the outside air flowing in. I know on a '99 Galant, you just had to take out the glove box, loosen two screws, and out she slid.

It'll be right near the blower motor, above the passenger's foot rest, behind the glove box. Simple hand tools will do it.

Be careful when pulling it out, as it may have leaves and acorns or fur all over it. Simply slide in the new filter and you're done.

You'll be surprised at how much better it'll smell, and how much harder your A/C and heat will blow without the constriction of a dirty filter.

Most cars have the cabin filters behind the glove box, but if not there, then they'll have them under the hood, on the firewall, on the passenger side. Usually inside a small black plastic box.

If your car DOESN"T have a cabin filter, then the musty smell is stuff that is sitting in the heat/ AC system. You can try spraying pine sol or Febreeze down the air intake hole for the system. Mind you, this is not the same as the air intake for your cars engine!

The air intake for the cabin filter will be on the passenger side, under the hood, most likely under a plastic cowling of sorts.

Good luck!