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| All Grand Cherokee WJ series models (1999-2004) and the new WK series (2005-up) feature a housing for installation of a cabin air filter. No models have ever come with the filter as standard, it must be purchased as a Mopar aftermarket accessory and installed under the front cowl. The filter allows a flow of unrestricted fresh air into the passenger cabin.
The cabin filter is a very worthwhile accessory. It removes solid particulates such as dust, pollen, mold, and bacteria from the air. Driving a vehicle with a clogged cabin air filter from dirt and debris drastically reduces the amount and quality of ambient air that can enter the interior and over time can lead to musty odors in your car as well as decreased HVAC performance. Mopar Cabin Air Filters remove up to 80% of particles one micron or larger. For reference, the human eye cannot detect particles under 20 to 25 microns. The filter is easily installed underneath the cowl cover on the passenger side, accessible from under the hood. Once installed, all outside air coming through the AC/Heater vents is filtered. For installation, the factory inlet cover is discarded and the filter housing and filter installed in its place. To keep cabin air quality at its best, filters should be replaced generally once a year or every 15,000 miles. Filters can be changed at 2 years/24,000 miles if mostly used in a cleaner environment (less driving on dusty roads and trails for example). Regularly changing cabin air filters also can reduce build-up of debris and bacteria on the evaporator core of your cars air conditioning and ventilation system, maximizing the life of the system. Cabin air filters stop most airborne particles, and to some extent are capable of reducing mild odors.
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