According to the leaks in this article, the Model 3 will not use traditional radiators and heat exchangers since they cause high drag. It sounds like they will use the front "nose cone" area as a heat exchange surface. Perhaps there will be liquid cooling channels milled into the back surface of these surfaces to allow hot coolant to be cooled. Here are a couple of bullet points for discussion. There may be radiators in the rear bumper for auxilliary cooling during supercharging The air conditioner needs its own heat exchanger (rear also?) Will there be an auxiliary air inlet in the front that can open during high demand? Will it be dangerous to have a hot bumper? How hot could the bumper be? What is the energy and noise penalty for using fans vs ram air for the AC at highway speed? Can this method actually provide enough cooling? Will paint color have an impact on powertrain cooling due to solar heating and emissivity differences?