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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 will recall more than 3.3 million vehicles in China for suspension defect

BEIJING (Reuters) - General Motors' joint venture in China, Shanghai GM, will recall more than 3.3 million Buick, Chevrolet and Cadillac vehicles stating Oct. 20 because of a defect with the suspension system, China's market regulator said on Saturday. GM Shanghai said in a text message to Reuters that the suspension arm may be deformed under extreme operating conditions, but there are no known casualties related to the issue. The recall includes cars produced between 2013 and 2018, the State Administration for Market Regulation said in a statement. GM will contact those affected and repair the vehicles free of charge, it said. (Reporting by Josephine Mason and Hallie Gu; additional reporting by Yilei Sun; Editing by Shri Navaratnam and Michael Perry)Related Video: Image Credit: Qilai Shen/Bloomberg via Getty Recalls Buick Cadillac Chevrolet Safety

Chevy Colorado and GMC Canyon get trim levels reworked again

GM Authority reports that GM has fiddled with trim packages on the Chevrolet Colorado and GMC Canyon for the 2021 model year, eliminating the base trims on both pickups and implementing small price changes. When the new model year goes on sale, the Chevy will lose the rear-wheel drive Base Extended Cab with the automatic transmission that starts at $22,395 after a $1,095 destination charge. The new entry-level is going to be the Work Truck model with the extended cab in rear-wheel drive, starting at $26,595 assuming the destination charge holds steady. That represents a $4,200 jump over the base 2020 model. MSRPs for the entire Work Truck lineup, from base to the Crew Cab Long Box, rise by $400. Elsewhere in the Colorado line, the four Z71 trims go down by $100, while the two ZR2 trims increase by the same amount. Only the six LT trims don't see any change.  The GMC side is a bit more involved due to previously announced changes. The 2020 Canyon comes in SL, Base Canyon, SLE, SLT, All Terrain, and Denali steps. Last month, GM Authority reported the 2021 Canyon would give all that up for the new names Elevation Standard, Elevation, AT4, and Denali. Since the SL base model retires in 2021, the Elevation Standard takes over at the entry level. Unlike on the Colorado, which sheds one trim, the Canyon lineup gets pared from 20 total combinations of trims, cab sizes, and bed lengths, to 14 total combinations. But like the Colorado, due to the loss of the cheapest configuration, the least expensive 2021 Canyon becomes $4,200 more expensive than in 2020, assuming the destination price remains the same. What's more, the 2021 Elevation Standard pricing adds $700 or $800 to the prices of the 2020 Canyon base and SLE models. There are more increases up the range. The 2021 Elevation trim replaces a combination of SLE and SLT models, bumping prices up by up to $900. In 2020, the least expensive All Terrain model is the Extended Cab Cloth for $37,695. For next year, the least expensive AT4 trim is the Crew Cab Short Box for $39,295. Like-for-like, though, the AT4 represents a $300 premium over the 2020 All Terrain Crew Cab Short Box. Three Denali trims will still stand at the top of the heap, each one going up by $400 in 2021. Until GM details the equipment changes, we won't know how the new pricing equates to value.