A heat transfer composition comprising trans-1,3,3,3-tetrafluoropropene ), carbon dioxide and a third component selected from difluoromethane, 1,1-difluoroethane, fluoroethane, 1,1,1,2-tetrafluoroethane, propylene, propane and mixtures thereof. The first and second surfaces are inclined at given angles to one of the narrower and wider surfaces. An internal combustion engine is located such that the rear air-to-air intercooler is located between the engine and the front air-to-air intercooler.