1st you need something that controls DC, you can't modify a mains
programmable timer because the control device is incompatible with the cars
12v DC.

Something like this - http://www.canfieldconnector.com/electronic_timers.htm

Industrial control or home automation places may be able to help.


Of course you could atttach a PDA with voice recognition to a radio in the
vehicle. Calling 'Xray Xray 5 minutes out' would kick the fridge into
hyperfreeze and ensure that the ale was really up to scratch!

:-)

Ian