CTS Coupe AWD V6-3.6L (2011)
Cabin Air Filter: Service and Repair
Owners Manual Procedure
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.
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 a new air filter is installed after removing the old one.