Cabin Air Filters
Cabin air filters clean the outside air from dust, pollens and other air borne debris before it enters the passenger’s compartment. They’re found behind the glovebox or under the hood by the firewall and depending on the manufacturer replaced every 10,000 to 15,000 miles or so.
They can get dirty fast depending on the driving conditions. Driving on dusty roads and other adverse conditions will wear the filter sooner. They get clogged with debris, restricting air flow as the driver or system attempts to draw in fresh air. If there’s little air flow from the vents while drawing in outside air and the fan is set to high, suspect a clogged cabin air filter.