Background It has been mandated by the EU Commission [Directive 2006/40/EC] that new vehicle "types" approved after January 1st 2011 must use an A/C refrigerant with a GWP (Global Warming Potential) of less than or equal to one hundred and fifty (GWP< or =150). Any registration after January 1st 2017 must comply with the requirements. Honda will use a new gas called HFO-1234yf. The GWP of this new gas is four (GWP=4). The supplier for Honda production and after sales activity is currently expected to be DuPont. The new 2012 Civic models have been approved under an extension of the existing approvals for the previous model year, and as such may continue to use R-134a. The upcoming 2013 CR-V will also be approved under an extension of the current model year and will use R-134a. According to current plans the first Honda model to have the new gas applied will be the full model change Jazz which will be 2015YM. We are providing this information now so that any dealer that is considering investment in new refrigerant handling equipment can buy machines and tools able to work with HFO-1234yf. This new gas has similar operating conditions as R-134a, it has the same cooling capacity and has required only small design changes to the A/C system. The mechanical properties of the new gas are very similar to R-134a, but with 0.3% the global warming potential. While the new gas will have similar properties to the current gas the two will not be interchangeable. System specification is different with gas specific internal valves and oils being used. Tools Requirements The new gas and the old gas must not be mixed. New machines and tools that are compatible with the new gas will have to be sourced. Honda policy is that ONLY HFO-1234yf is used in cars originally equipped with this new gas. The new gas is classed as a flammable fluid and it is therefore very important that R-134a is not mixed with HFO-1234yf. If suppliers offer adapter kits to allow the mixing of gasses do not use these!