That sounds like an air filter for the passenger compartment
IT IS LOCATED BEHIND THE GLOVE BOX (GLOVE BOX MUST BE REMOVED). The 2003 Sliverado does not have a cabin filter, you can take the truck down to the frame and you won't find it. The car parts still list one for the 2003 but when you look at the size of it and then look under the dash it is apparent there is not cabin filter space. The filter is a big as the air filter. Also, the 2003 Silverado owners manual does not list a cabin filter. Hope this helps.
Behind the glove box!
behind the glove box
The cabin filter is behind the glove box compartment.
It's easy. It is behind the glove box.
the cabin filter is located behind the glove box. Look in your owners manual. you have to remove the glove box to access the filtewr.
I own both a 2008 tundra and a 2003 4Runner. Both of them have a cabin filter behind the glove box. Remove the glove box door and you will find it.
You can find behind the glove box compartment.
Open the glove compartment, gently squeeze in on both sides of the open compartment, then you can pull the whole glove box out. The air filter is behind there.
There is a plastic trim/door, under/behind the glove box, filter slides in /out.
I own both a 2008 tundra and a 2003 4Runner. Both of them have a cabin filter behind the glove box. Remove the glove box door and you will find it.
I have a 2003 (may be the same for your 2006) and the cabin filter is behind the glove compartment. I had to remove the glove compartment and then I could get to the cabin filter to replace it. Kind of hard to get to, but I was able to do it myself.