Repair manual

SULEV 2.0L TFSI Engine
42
Function
The entire cooling surface of the car’s radiator is coated
with catalytic material.
When air flows through this specially coated radiator, the
ozone in the air is converted to oxygen (chemical symbol
O
2
). Ozone (chemical symbol O
3
) is a gas which is harmful
to health.
Given that the air in a car radiator can flow at up to two
kilograms per second, a car with a PremAir
®
radiator
makes a significant contribution to reducing near-
surface ozone levels. The efficiency of this technology
is particularly high in strong sunlight and at high air
pollution levels.
This ozone catalyst technology is also used on aircraft,
where it prevents stratospheric ozone from entering the
cabin through the air conditioning system. The same
technology is used in printers and copiers.
To receive EPA “credits” however, the Air Resources Board
(ARB) requires not only a PremAir
®
radiator installed on
the vehicle, but also a monitoring system that ensures its
proper function and reliability at all times.
Therefore, this special radiator is monitored by Radiator
Identification Sensor G611.
Treated Air with
Reduced Ozone Content
Incoming Ambient Air
Containing Ozone