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What I'd be interested in is putting enough TEGs on the exhaust to run some TECs for air conditioning.
From what I've read, the best efficiency for TECs is at half their rated maximum voltage. Higher than that the heat produced from the hot side goes up much faster than the cold side. Instead of trying to cool a volume with one big TEC at 12 volts, try two of the same size at 6 volts (put them in series to divide the voltage) to get more cooling with the same power input. If you need an extra chill, switch the TECs to parallel.
Clamp TECs between aluminum blocks with channels for coolant. Plumb the hot side to an air conditioning condenser and the cold side to the vehicle's heater core. Add some valves to isolate the TEC unit and heater core from the engine coolant, while using part of the power from the TEGs on the exhaust to run electric pumps on the hot and cold sides of the TEC unit. The heat exchangers on the TECs have to be thermally isolated from each other so heat doesn't flow through to the cold side. TEC coolers usually have shouldered plastic bushings at one or both ends of the mounting bolts through their heat sinks.
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