To keep the system working properly, make sure you replace your cabin air filter every 12,000–15,000 miles or as recommended by your vehicle manufacturer. A clogged filter can reduce airflow and allow odors and allergens to build up.
Understanding this small button can make a big difference. When used at the right time, the air recirculation feature helps your car cool faster, breathe cleaner, and keep you more comfortable in every season 
