The electronic control has an electric control which incorporates circuitry which will generate heat in use. A cooling channel placed in contact with at least one surface on the electric control. The cooling channel has a portion which receives an enhanced heat transfer surface. At least one electrode pair is mounted on an inlet channel portion upstream of the portion of the channel that receives the enhanced heat transfer surface. A source of current is provided for the electrode. The electrode induces an electric field in the inlet channel, to drive a dielectric fluid across the enhanced heat transfer surfaces.