The cooling system of the vehicle is constructed in a way that makes it possible to drive up gradients with the maximum load. Further, the cooling system works also at very high temperatures without any loss concerning the driving comfort or the air conditioning system. In Granada the developers find ideal conditions for the testing of the cooling system. The test drive up in the Sierra Nevada offers a long and steep gradient. There are although constantly high temperatures at least 35 degrees Centigrade or 95 degrees Fahrenheit. The developer Markus Welser explains in the film, how the test program works.