7 Cooling devices and cooling systems, especially for motor vehicles, including especially for combustion engines and alternative drives in the nature of electric motors and fuel cells, and parts therefor, as well as components in the form of subassemblies, namely, cooling modules; oil modules and exhaust gas recirculation modules for use in motor vehicle engines, and parts therefor, namely, coolant coolers, refrigerant condensers, charge air coolers, oil coolers, electronics coolers, battery coolers, fuel coolers, servo steering oil coolers, low temperature coolers, blowers, fans and fan blades, fan drives, fan clutches, fluid friction clutches, exhaust gas heat exchangers, exhaust gas recirculation valves, coolant pumps, connecting tubes for motor vehicle coolers, coolant hoses and auxiliary heaters