it could be a leaky windshield or a hole in the firewall or maybe someone had changed the cabin filtre and didn't replace everything
Behind the glove compartment.
Passenger side firewall behind glove compartment.
Passenger side, either behind the glove compartment or behind the kick panel.
Behind the passenger side kick panel or behind the glove compartment.
It's usually located against the firewall, in the passenger compartment, below and behind the glove compartment door, passenger side.
That sounds like an air filter for the passenger compartment
Passenger side under the dash behind the glove compartment.
Behind the passenger side kick panel or behind the glove compartment.
Behind the glove compartment or behind the passenger side kick panel.
Usually by the passenger side firewall Some are accessible behind the glove box (inside the passenger compartment) Some are accessible at the firewall (outside the passenger compartment)
In the passenger compartment behind the glove box. The glove box must be removed as well as the lower dash trim to get to it.
It's either behind the glove compartment or behind the passenger side kick panel.