see GitHub here.
Gist for steps used to setup pi here.
Just getting started....
Developing the interface in python using kivy and inkscape for the graphics and doing research on how to bring everything together.
Once I get the climate control interface developed I will start working on the connection to the trucks CAN-BUS to get the pi to control the AC, will probably move to the iPod integration/control then.
CAN-BUS References:
Installing Python-CAN for Raspberry Pi
iPhone Control References: