The Forester has two air filters: the engine air filter in the engine bay and the cabin air filter behind the glove box. This guide explains where to find both and how to access them for inspection or replacement.
Engine air filter location
To locate and replace the engine air filter, begin by opening the hood and tracing the large intake hose from the front of the vehicle toward the engine. The filter sits in a rectangular plastic housing with a removable lid, secured by clips or screws.
- Look for a square or rectangular black plastic box with a ridged lid in the engine bay; a wide intake hose connects to the box and leads toward the throttle body.
- Release the fasteners (clips, bolts, or screws) on the lid, then lift it off to expose the filter.
- Remove the old filter and inspect the sealing gasket for cracks or debris; note the orientation marks on the filter for proper installation.
- Insert a new filter in the same orientation, ensure it sits flat in the housing, and reseat the lid. Re-secure with the clips or screws.
- Reconnect any hoses or clamps you may have loosened and close the hood.
With the engine air filter replaced, the engine will draw cleaner air, which can improve performance and fuel efficiency and help prevent dust from entering the intake system.
Cabin air filter location
The cabin air filter is located inside the vehicle, behind the glove box. Access typically involves lowering or removing the glove box to reveal the filter housing. Make sure the ignition is off and the HVAC system is cool before you begin.
- Open the glove box and remove its contents; in many models you can drop the box by gently squeezing the sides or removing the hinge damper.
- Locate the rectangular access panel behind the glove box; release any clips or screws to open the cabin filter housing.
- Slide out the old filter, taking note of the directional arrows printed on the filter frame.
- Insert a new cabin filter with the arrows pointing toward the blower motor, reseal the housing, and reassemble the glove box.
Replacing the cabin filter helps keep the interior air clean and reduces odors, especially in dusty or urban environments.
Summary
In a 2011 Subaru Forester, there are two filters to know about: the engine air filter in the engine bay and the cabin air filter behind the glove box. Accessing and replacing them is a straightforward DIY task that can improve engine performance and interior air quality. Check the owner’s manual for the recommended replacement intervals and any model-specific instructions, and use proper safety precautions when working on the vehicle.