Join Date: Feb 2012
Location: Northwest Indiana
Car Year: 2006
Car Model: 2006 & 2010 Forester
Guessing you don't open your hood much...
If you do...
On the left side(as you are looking at it, not as if you were in the car) you see this big plastic box. The biggest plastic box under the hood. That is the air filter.
Did you recently get an oil change and purchase an air filter?
This "glove box tube thing" you allude to is the cabin filter, totally different thing...and if that is what is causing this, god help us all...(as in a cabin filter doing this is pretty much impossible)
'06 For X Prem, '10 For X Prem + WP, both 4EAT