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Mercedes C-Class Cabriolet advances to prototype stage

Following up on last month's sighting of the Mercedes-Benz C-Class Coupe, we've got a pretty sizable update on the C-Class Cabriolet, after a prototype of the new droptop was spotted undergoing testing in Germany. A quick comparison with last year's spy photos shows that Mercedes has made a lot of progress, moving on to full-blown production prototypes with a minimal amount of camouflage. Really, though, we already knew what the C-Class Cab would look like – identical to a C-Class sedan below the beltline, although the tail will likely be a bit more sporting – these spy photos merely confirm that. Expect to see the production C-Class Cabriolet debut at (or more likely shortly before) the 2015 Frankfurt Motor Show, where it will appear alongside the next-generation C-Class Coupe. Check out the spy photos up top. Related Video:

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.

Mercedes-Benz C-Class Coupe looks just as banging as big brother

When Mercedes-Benz redesigned the C-Class, the new sedan was crafted as a sort of baby S-Class, both inside and out. So is it really any surprise that with the 2017 C-Class Coupe, MB has once again looked to its flagship model for inspiration? The new C Coupe is, for all intents and purposes, a scaled-down S-Class Coupe, featuring many of the same styling cues that make that big two-door such a stunner. The pert tail is set off by the same kind of duck-bill spoiler integrated into the rear decklid and horizontal taillights. A strong shoulder line emphasizes the aggressive slope of the roof and the high beltline, which if anything is more aggressive than what Mercedes penned for the S-Class Coupe. Up front, a strong grille is flanked by scale model's of the S Coupe's headlights, complete with LED lighting accents. It's a similar story in the cabin, where Mercedes scaled things down but really didn't skimp on style or materials. Expect the C Coupe's mechanicals to mirror those of its four-door counterpart. The C300, the only version of the new two-door to be announced so far, will use the same 241-horsepower, 273-pound-foot, 2.0-liter, turbocharged four-cylinder as the C300 sedan. We'd expect the rest of the engine range to get fleshed out over time, with the more potent C400, C450 AMG Sport, and C63 AMG coming online. While not specified, a seven-speed automatic should be on hand to funnel power to either the back wheels or to a 4Matic all-wheel-drive system, here in the C300. As for optional extras, Mercedes specifically mentions an Airmatic suspension, a vast suite of safety systems, and a 360-degree camera, to name just a few. As with the engine lineup, expect the options sheet to mimic the C-Class Sedan. You can read more about the new C-Class Coupe in the attached press release. We've also embedded a hefty gallery of images at the top of the page. The new C Coupe will make its auto show debut at next month's Frankfurt Motor Show, and will hit dealers in the US next this spring. Related Video: The all-new MY2017 C300 and C300 4MATIC Coupe Seduction of the heart and mind Stuttgart – Athletic and sporty, the vivid, sensual design of the new C-Class Coupe cuts a fine figure on the road and embodies modern luxury. At the same time, its interior raises elegance and style to a sporty level.