1957 Mercedes-benz 200-series 220s Cabrio on 2040-cars

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VW joins Daimler's protest of new A/C refrigerant as EU deadline for compliance passes

The case of Dupont and Honeywell's refrigerant R-1234yf is doing the exact opposite of keeping things cool. The two chemical companies have spent years and hundreds of millions of dollars developing R-1234yf to replace R-134a, the new refrigerant shown to be 99.7-percent kinder to the environment than the one it is meant to succeed. Part of that development has been years of testing by governments, outside safety agencies and automakers to approve the chemical for use in cars. It passed the protocols necessary for the European Union to declare that new and significantly revised cars from 2013 onward needed to use R-1234yf, and mandated that every car as of 2017 must use it.
Enter Daimler AG. The automaker created a head-on collision test with a B-Class at their Sindelfingen test track that would lead to the pressurized refrigerant being sprayed on the engine. The result in 20 out of 20 test was that the refrigerant burst into flames as soon as it hit the hot engine, while Daimler says that R-134a does not catch fire in the same test. Another unexpected result of the R-1234yf test was the release of hydrogen flouride, a chemical far more deadly to humans than hydrogen cyanide, emitted in such amounts that it that turned the windshield white as it began to eat into the glass.
Said a Daimler engineer in a Reuters piece, "It was scarcely believable. The most complicated lab tests conducted using the most sensitive measuring instruments around found nothing and all we do is drive a car around a couple of times, open a tiny hole in the refrigerant line and the next thing you know the car is on fire." So Daimler said it wouldn't use the refrigerant, and it recalled the cars it had already shipped with R-1234yf.

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New Mercedes-Benz S-Class Coupe spied in revealing state of dress

During a product briefing earlier this year, Mercedes-Benz told us that 2013 would be the "year of the S-Class." Makes sense, too, since the flagship Mercedes is so very close to finally showing its production-ready face. But the high-tech saloon isn't the only S-Class to talk about this year - quite the contrary. Seen here in decidedly revealing camouflage, the new S-Class Coupe will be joining its four-door compadre in the not-too-distant future, as well.
When it launches, the S-Class Coupe will officially do away with the CL-Class nomenclature. This doesn't come as a huge shock. After all, when the new E-Class coupe and convertible were launched, it officially marked the end of the long-running CLK-Class designation.
Thanks to the interesting camouflage seen here, we have a very good glimpse at how the S-Class Coupe will look when all of the molding and swirly paper are peeled off. Rakish body lines pulled from the CLS-Class meet a much more dynamic front fascia. Out back, there are horizontal taillamps rather than the vertical units used on the current car, and the whole package seems very svelte. Our spy photographer even posits that this will be "the best-looking car from Mercedes-Benz in ages."