Re: Heavy on the power mind you
These modules are for development and bleeding edge systems. The tech that makes it into mass-market cars will be smaller and use less power, while the high-end cars move on to using the next round of exotic tech.
But really, you are worried about supply 250W and getting rid of the heat in a motor vehicle? That's 0.25KW. The vehicle this will be put into will have at least 1000x that power available, with much of that being sent off as heat.
I'm a little biased, but I do question the wisdom of integrating a cellular modem into a vital part of the car such as the dashboard. Many luxury cars on the road still have the useless remains of center-console phones. More recent middle-market cars have useless cell phone docks. The communication part should be a physically and logically separate module so that it's possible to do the equivalent of updating a 8 track player to a cassette player (errmmm, CD, uhmm, DVD uhmm Blueray head unit).