The passenger compartment air filter traps most of the pollen from the air entering the vehicle. Like your vehicle's engine air cleaner/filter, it needs to be changed periodically. See Scheduled Maintenance .
Using the climate control system without the passenger air filter installed could let water or other debris enter the system. This could cause a water leak or noises. Make sure to install a new air filter after removing the old one.
The passenger compartment air filter is located underneath the hood below the windshield wiper arm on the passenger side of the vehicle. See Engine Compartment Overview for more information on location.
To replace the passenger compartment air filter:
This allows you access to the leaf screen. The passenger compartment air filter is located under the leaf screen.
See Maintenance Replacement Parts for the correct part number for the filter.