Re: what is this?
From what I remember when pulling apart my buddy's Samurai, the A/C brainbox has a silver metal housing, in contrast to the engine's brainbox housing which is just plain plastic.
I don't recall the manufacturer of the A/C brainbox however, so I most definitely could be wrong. I just can't think of what else that could be, since I can't recall seeing anything else that looks like that on a Zuk. I'm sure someone will eventually pipe up with the correct answer.
-- Geoff Beasley