Cooling Fans Again

[BeanCaker]

On my Golf GTi (sorry!)the cooling fan is wired independently of the ignition circuit, such that it continues running after turning the engine off, until the engine has cooled to a sensible temperature. The Griff fans cut-out with the ignition - surely better for the engine if the fans kept up the cooling for a minute or two? Anyone tried rewiring them, or is this just a sure-fire recipe for a flat battery!