Cadillac 2008 CTS - Manual (Page 166)

Passenger Compartment Air Filter
The passenger compartment air filter traps most of the
dust and pollen from the air entering the vehicle.
The filter will need to be changed periodically. See
Scheduled Maintenance on page 6-4.
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
and the screen on the passenger side of the vehicle.
See Engine Compartment Overview on page 5-14
for more information on location.
To replace the passenger compartment air filter:
1. Turn the ignition to ON/RUN with the engine off.
2. Turn on the windshield wipers and turn them
off again when the wipers are straight up on
the windshield.
This allows access to the leaf screen. The
passenger compartment air filter is located under
the screen.
3. Open the hood to access the engine compartment.
See Hood Release on page 5-13 for more
information.
4. Remove the three screws that hold the screen in
place and lift off the screen by lifting and sliding it
toward the center of the vehicle.
5. Pull out on the two tabs located on each end of the
filter cover.
6. Lift the filter cover off by pulling it straight up.
7. Remove the old filter and insert a new one.
See Maintenance Replacement Parts on page 6-13
for the correct part number for the filter.
8. Reverse Steps 1 through 6 to reinstall the cover.
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