Hello McAlice,
I think the members of this forum will be able to answer your question.
1. For what concern the engine cooling, the radiators are located in the front of the car. Are you looking for specific information? I do not know more about the cabin cooling
2. Regarding the downforce, the rear diffuser generates the ground effect, aided by the suction generating fans (
http://www.automotiveforums.com/vbul...ht=fan+suction).
Does anyone have any figure about the amound of downforce produced at given speeds?