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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

GM recalls Colorado, Canyon, and Malibu for airbag problem

The Basics: General Motors will recall and issue a stop sale on 1,740 total examples of the 2016 Chevrolet Colorado, Malibu, and GMC Canyon. This includes 1,579 units in the US and 161 in Canada. The Problem: The second stage of the driver front airbag inflator might not be present. If this happens, the airbag won't fill as quickly as it should in a high-speed crash, which could increase the risk of injury, according to Reuters. This is not related in any way to Takata's inflator problems, and these parts come from a different supplier. Injuries/Deaths: None reported. The Fix: GM will replace the vehicles' airbag assemblies. If You Own One: GM spokesperson Tom Wilkinson told Autoblog he wasn't specifically sure when recall repairs would begin but said it would be "shortly." He expects the fixes to happen "quickly" because of the small number of affected vehicles, and many of them are either in transport or already in dealer stock. More Information: GM recalled the 2015 Canyon and Colorado in 2014 for a completely separate airbag issue. In that case, a manufacturing error improperly wired the connectors. Related Video: GM Statement GM is recalling 1,579 MY 2016 Chevrolet Colorado, GMC Canyon and Chevrolet Malibu vehicles in the United States and 161 in Canada to replace driver-side front airbags. The second stage of the airbag may not deploy properly in certain high-speed crashes. During a routine quality inspection, it was determined that a component required for a second-stage/high-output deployment was not loaded during the inflator build. Dealers will replace the driver-side front airbag assembly. There have been no reports of crashes or injuries related to this issue. This issue is unrelated to the ongoing Takata recalls.

Nissan Leaf hits 3,000 sales in July, Chevy Volt climbs over 2,000

It was a good sales month for both the Nissan Leaf and the Chevy Volt, with the two 'elder statesman' plug-in vehicles reaching numerical milestones in July. The Leaf sold 3,019 units and the Volt crossed the 2,000 sales level for the first time in 2014, hitting 2,020 sales. With Tesla also announcing it is delivering around 2,500 Model S EVs a month (but that's globally, compared to the US-only numbers for the Volt and Leaf we're talking about here) and Ford's plug-in vehicles selling well, we are certainly in a golden moment for EV sales. The Volt was a bright spot for the Bowtie brand last month. For the Volt, the 2,020 units sold represents a 13 percent increase from July of 2013 even thought year-to-date sales are down 8.7 percent this year compared to last year. Overall, total Chevrolet deliveries for July 2014 were up eight percent compared to 2013, so the Volt was a bright spot for the Bowtie brand last month. On the Leaf front, this is only the second time that the EV has sold more than 3,000 units in a month (the other being in May of this year). The year-over-year increase for the Leaf was 62 percent in July and represents the 17th straight month of record sales, as Nissan is more than happy to report each month. Overall, Leaf sales are up 34.6 percent, year-to-date, and Nissan's director of Leaf sales and infrastructure, Brendan Jones, said in a statement that a free public charging incentive was responsible. "Since we launched the No Charge to Charge promotion in the first 10 markets, we've seen a surge in Leaf sales in those areas. Leaf sales in the northeastern US are also picking up with new tax incentives for Massachusetts and Maryland residents." With No Charge To Charge set to expand to 25 markets over the next year, we expect Leaf sales to continue to grow. We will have our monthly look at all green car sales available soon, so stay tuned. Green Chevrolet Nissan Electric PHEV ev sales