If your car has climate control, then it also has a cabin filter. Cabin filters are simply air filters for the interior of your car, truck, or SUV. All air entering circulation through the climate control system first passes through this filter, to prevent your AC or heat systems from accumulating debris or blowing them out of your vents. The result is cleaner, quieter, and longer-lasting climate control systems, which keep the inside of your car as comfortable as possible.