Cadillac drivers will be among the first in the US to experience the cooling effect of the refrigerant HFO-1234yf, following the decision by General Motors to install the low-GWP gas on its US models from 2013.
Developer Honeywell claims a 99.7 per cent improvement on the GWP of the gas it replaces, R134a.
In Europe, the MAC Directive requires R134a to be phased out from new models by 2011, but GM is the first US carmaker to announce replacement plans.
On average, Honeywell said, R-134a has an atmospheric life of more than 13 years, giving it a GWP of 1,430. By comparison, the new refrigerant stays in the atmosphere for just 11 days and has a GWP of only 4,
The use of HFO-1234yf will help GM vehicles significantly exceed US greenhouse gas regulatory targets, which require an overall 40 per cent improvement in overall US fleet average vehicle fuel economy by 2016.
Honeywell has formed a joint venture with DuPont to build the first production plant for 1234yf in Zhonghao,China, which will start supplying gas from late 2011.