Cadillac 2013 Escalade Owner Manual M page 232

8-8 Climate Controls
Keep the air path under the front
seats clear of objects. This helps
air to circulate throughout the
vehicle.
Adding outside equipment to the
front of the vehicle, such as
bonnet-air deflectors, may affect
the performance of the heating
and air conditioning system.
Check with your dealer before
adding equipment to the outside
of the vehicle.