Here is how to clean the air box on a Chevrolet truck. If you have a Chevrolet truck built before 1998, there is no cabin air filter to change but the cabin air box does get full of leaves and dirt. You can open it up and wash it out to make it cleaner and to make your air conditioner blow harder. Cleaning out the airbox on your Chevrolet truck will increase airflow and make the system more efficient.