There are two air filters in this model: the engine air filter located in the engine-bay air box on the passenger side, and the cabin air filter located behind the glove box. This article explains where to locate both and how to access them for inspection or replacement.
Engine air filter location
The following information helps you identify and access the engine air filter box in the Suburban’s engine bay.
Where to find it
In the engine compartment, the engine air filter sits inside a rectangular plastic housing on the passenger side of the bay, near the front edge. The housing is connected to the large intake hose that runs toward the throttle body.
Note: Some trims or configurations may vary slightly, but this location is typical for the gasoline engines found in the 2018 Suburban.
- With the hood open and the engine off, locate the rectangular air-filter housing on the passenger side of the engine bay. Identify the clips or screws securing the lid.
- Unclip or remove the screws to lift the lid and expose the used air filter. Inspect the inside of the housing for debris or a torn filter.
- Install a new filter with the airflow arrows oriented toward the throttle body. Ensure the filter sits evenly and seals around all edges.
- Reconnect or secure the housing lid with clips or screws. Reattach any hoses that were removed and close the hood.
Regular inspection and replacement of the engine air filter help maintain engine performance and fuel efficiency. For the exact replacement interval, consult your owner's manual or a Chevrolet service professional, as conditions and engine variants can affect timing.
Cabin air filter location
The following guidance covers locating and replacing the cabin air filter, which affects interior air quality and HVAC performance.
Where to access
The cabin filter is located behind the glove box on the passenger side. Access typically requires you to open the glove box, release the damper, and drop the glove box down to expose the filter housing behind it.
As with the engine filter, occasional variations can occur by trim level, but the cabin filter in the 2018 Suburban is commonly behind the glove box.
- Turn off the vehicle and remove any items from the glove box. Squeeze the sides of the box or follow the hinges to detach it and allow the door to drop down.
- If present, disconnect or move the glove box damper to enable full access to the filter housing behind the box.
- Unclip or unscrew the cabin filter housing cover and remove the old filter. Wipe the housing if needed to remove dust and debris.
- Insert the new cabin filter with the airflow arrows pointing toward the blower motor (toward the inside of the vehicle). Reattach the housing cover and clips.
- Raise the glove box back into place and secure the damper. Close the glove box and run the HVAC for a few minutes to verify proper airflow.
Replacing the cabin filter helps maintain interior air quality, particularly in dusty or urban environments. Check GM recommendations or your local technician’s guidance for suggested replacement intervals, as they can vary by usage and climate.
Summary
The 2018 Suburban contains two separate air filters: the engine air filter housed in a passenger-side air box in the engine bay, and the cabin air filter located behind the glove box. Access each by releasing its respective cover, replace with filters oriented correctly, and resecure all components. Regular checks keep both engine performance and interior air quality at their best.