Abstract: In the field of cooling of internal combustion engines a known characteristic of thermostatic flow control valves is their lagging control response to variable rates of internal heat generation in the engine. Further, there is a thermal inertia effect due to engine mass and internal fluids masses which masks imbalances between instantaneous internal heating and cooling rates, in many cases allowing internal temperatures to rise excessively and pre-ignition damage or other heat-related component damage to occur to the engine system. The invention seeks to overcome these known characteristics using simple apparatus with a method to effect improved operation of the cooling system.