7 [ Fluid friction clutches, not for land vehicles; cooling systems for combustion engines and alternative drives, comprising electric motor and fuel cell, for motor vehicles and their parts and components, namely, cooling modules, oil modules, exhaust-gas recirculation modules and individual parts therefor, namely, radiators, refrigerant condensers, charge-air coolers, oil coolers, electronic coolers, battery coolers, fuel coolers, power steering oil coolers, low temperature coolers, blowers, fans and fan shrouds, fan drives, fan clutches, fan couplings, fluid friction couplings and exhaust-gas heat exhangers, exhaust-exhaust-gas recirculation, pumps, coolant pumps, auxiliary heaters, valves, heat exchangers in the nature of radiators, refrigerant evaporators and condensers, PTC (positive temperature coefficient) heaters and PTC (positive temperature coefficient) controllers, refrigerant expansion valves, coolant pumps and coolant compressors, manifold and dryers for coolant ]