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Mercedes engineers found under particular conditions the mandated Freon R1234yf is extremely flammable and prone to ignition in certain extreme situations.

Mercedes seems to be extremely confused as to why the French are disregarding the further research Mercedes has put into the Freon.

Mercedes engineers replicated situations which R1234yf could be sprayed onto hot engine components and ignite, likely to occur in a head on collision. Similar tests with R134a (current Freon) came back negative.
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