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Hi I have all stuff for my 2006 ve ssv to have dual climate controlYou have to have the SSV or Calais centre console upgrade, which has the schematics built into it and the buttons on the facia to be able to control the HVAC (dual zone).
Was pretty easy. Which style console you choose will depend on your current model, SV6 / SS = SSV console, Omega / Berlina = Calais console.
Find a wreck SSV or Calais. Get the centre console and the HVAC to go with it. Get it programmed with your VIN (plenty of people on forums and Facebook groups, just ask where) and it will plug and play when installed.
The only thing that wont work is the outside temp.
It's handy if your cold-blooded partner is sitting on the passenger seat...My car came with dual zone but I have only ever used it in single zone mode, dont really see the point of it.