Control system for a vehicle cooling system

A control system (310 fig 7a) is provided for a cooling system of a vehicle, which uses a radiator 22 and an air flow directing mechanism (14, 16 fig 4) which can be put into a first position directing air via a wheel region (18 fig 2) and a second position bypassing it. The control system determines a cooling parameter in dependence on a received first signal indicative of a cooling requirement and a second signal indicative of a vehicle operating condition, and then outputs a director signal in dependence on the cooling parameter, which controls the directing mechanism into the first or second position. Aspects of the invention also relate to a cooling system: a directing mechanism; a cooling fan 12; a vehicle (1 fig 1); a method (400 fig 8); computer software; and a computer-readable storage medium. The invention utilises air pressure in a wheel region and is effective at regulating radiator cooling and is applicable where there is a low temperature gradient and for example in electric vehicles and in fuel cell vehicles.