[Old Professer]

I imagine their design uses the engine heat as a "bath;" as the electrical current flows through the chip along the one conductor that is in the bath the opposite side of the chip surface (a dissimilar metal) becomes cool proportionately to the heat of the bath and this cool surface would need to be in the airflow of the fan(s) directing the cooled air through the cabin.

My big problem has to do with the surface area of the chip(s) vs the cubic volume of space being chilled.

Condensate control would also be a factor, but perhaps they are using bonded finned-sinks within a housing.

It would be nice to see an engineering diagram.

[Nov3]

You are right on. The other thing is an airconditioner for a car has to large enough to cool a good size house. A car is a steel and glass uninsulated greenhouse that has to be cooled from 130+ inside temps to 70 in a reasonable time.