The engine air filter sits in a rectangular housing in the engine bay on the passenger side, and the cabin air filter is behind the glove box in the cabin. This article explains how to locate and, if needed, replace both filters.
In the 2008 Elantra, there are two distinct filters to consider: the engine air filter in the under-hood air box and the cabin air filter that serves the HVAC system. The sections below outline their locations and basic replacement steps.
Engine air filter location
Where to find it
Under the hood, the engine air filter is housed in a rectangular plastic box connected to a large intake tube feeding the throttle body. On most Elantras, this box is toward the passenger side of the engine bay near the front, with a snap-on or screw-fastened lid.
To replace the engine air filter, follow these steps:
- Open the hood and locate the rectangular air filter housing on the engine bay, attached to a thick intake tube.
- Release the clips or screws securing the lid and lift it off. Some models use clips, others use small screws—use a screwdriver if needed.
- Remove the old filter and wipe out any dirt or debris inside the housing.
- Insert the new filter with the correct orientation (the filter typically has an arrow indicating airflow toward the engine).
- Reattach the lid and secure all clips or screws, then close the hood.
After replacing the engine air filter, confirm the housing is sealed and there are no gaps where unfiltered air could enter. Start the engine to ensure there are no unusual noises indicating a loose fit.
Cabin air filter location
Where to find it
The cabin air filter for the 2008 Elantra is located behind the glove box. Access typically involves lowering the glove box, releasing its stops, and opening a small panel that covers the filter.
To replace the cabin air filter, follow these steps:
- Empty the glove box and gently push in the sides or squeeze the damper to lower the glove box compartment.
- Look for a rectangular access cover behind the glove box and remove it to reveal the cabin filter.
- Carefully slide out the old filter, taking note of its orientation.
- Insert the new filter with the airflow arrows pointing in the direction of HVAC airflow (usually toward the interior of the car).
- Reinstall the access cover, lift the glove box back into place, and ensure it is secured.
Note that some trims may use a slightly different panel or additional fasteners. If the glove box won’t drop fully, check for any remaining stops or dampers that must be released.
Summary
For a 2008 Hyundai Elantra, there are two separate air filters to locate: the engine air filter in a rectangular housing under the hood on the passenger side, and the cabin air filter behind the glove box. Replacement steps involve releasing fasteners on the engine air box and removing a panel behind the glove box for the cabin filter. Regular replacement is part of routine maintenance; refer to the owner’s manual for specific intervals and heed driving conditions that may require more frequent changes. If you’re unsure or encounter resistance, a professional mechanic can perform the replacement and inspect the intake system for leaks.