VNL Hot Weather Testing This summer, Volvo Trucks engineers ran the all-new Volvo VNL through grueling hot-weather testing in the deserts of Arizona, Nevada, and California, where temperatures can soar to 120 degrees Fahrenheit and often linger in the mid-110s. VNL Hot Shutdown Seen here at the top of Union Pass on the steep Davis Dam Grade, the all-new Volvo VNL is in the middle of one of the most demanding evaluations – the “hot shutdown,” where trucks are driven up a 10-mile grade in triple-digit ...