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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.

Car owners getting more irritated with their repair experiences, study says

The J.D. Power U.S. Customer Service Index Study (CSI) is a barometer of a vehicle owner's happiness with the service experience. While it wasn't all bad in the 2023 study, the overall owner satisfaction score dropped. This year's tally of 846 out of 1,000 is two points down from 2022, the 43-year-old study's first decline in more than 28 years, and one point down from 2021. However, the overall score remains well up from the pre-pandemic scores of 821 in 2018 and 837 in 2020. The study claims the stumbling block is the horde of BEV launches. The flood into the new energy space has created a recall rate among EVs that's more than double the rate for ICE vehicles. Furthermore, dealership service department knowledge of EVs isn't on par with internal combustion engine expertise, leaving EV owners less satisfied with service advisors compared to ICE owners. Chris Sutton, VP of automotive retail at J.D. Power, said, "As training programs for service advisors and technicians evolve, EV service quality and customer experience must address both the vehicle and the unique customer needs. The EV segment has the potential to spur massive convenience improvements in how customers service their vehicles — but weÂ’re not seeing the benefits yet." Matters are slightly worse for all owners, though, with labor and parts shortages contributing to longer wait times for service appointments. The CSI study surveys owners and lessees of one- to three-year-old vehicles to gauge their happiness with service at franchised dealer or aftermarket service facilities for maintenance or repair work. The criteria in order of importance are service quality (32%); service advisor (19%); vehicle pick-up (19%); service facility (15%); and service initiation (15%). Lexus retains the top spot for luxury brands, giving it three wins in four years. The Japanese automaker won in 2020 as well, its run interrupted by Porsche in 2021. Cadillac, Infiniti and Acura complete the luxury top 5.  For mass-market cars, Mitsubishi wins again after a victory in 2021 and falling to fourth last year. It's followed by Mazda, Buick, Subaru and Mini.  Considering the different service needs and service experience of different body styles, the study has broken results out by segment for the first time. Lexus earned a second victory thanks to winning the premium SUV segment, and Mitsubishi earned a second victory by winning the mass-market SUV/minivan category.

GM Recalling Another 2.7 Million Vehicles In Five Separate Campaigns

The recalls keep rolling in from General Motors, evidently keen to avoid repeating the mistakes of the ignition-switch debacle and clean house. This time they're all coming at once, with five separate recalls announced together covering approximately 2.7 million vehicles. The largest of the five actions involves over 2.4 million units of the previous-generation Chevrolet Malibu and Malibu Maxx, Pontiac G6 and Saturn Aura in order to fix brake light wiring harness, which have been found to be susceptible to corrosion. The recall is separate from the 56k Aura sedans which GM recently recalled over faulty shift cables, not to mention the previous massive recall of 1.3 million vehicles – some of them the same models – but appears to have resulted from the National Highway Traffic Safety Administration investigation that started with the G6 almost a year ago. The second-largest campaign involves the 2014 Chevy Malibu, specifically those fitted with GM's 2.5-liter engine and stop/start system, approximately 140,000 examples of which has been found to have problematic brakes. The issue does not appear to be connected to the recall of 8k Malibu and Buick LaCrosse sedans (also involving brake woes) which we reported upon last week. Four crashes have been reported in such models, but GM admits it's not yet clear if the problem was a contributing factor in the accidents. A further 112k Corvette models from the 2005-2007 model years are being called in for problems with their low-beam headlamps resulting from a flexing relay control circuit wire that's not meant to bend. GM says it is "aware of several hundred complaints" about this issue, but notes that there have been no reports of related accidents. In addition, over 19k examples of Cadillac CTS from the 2013 and 2014 model years are being recalled over windshield wipers that might not work after a jump start. Finally, GM is also bringing in 477 examples of its 2014 Chevy Silverado, Tahoe and GMC Sierra (though not the Yukon) to fix a problem with a tie rod in its steering rack. As ever, all recall repairs will be performed free of charge, and GM is now estimating that recall-related actions this quarter will result in an estimated $200-million charge against its second-quarter earnings. Read the full announcement from GM below for further details.