7th June 2011, 07:12 AM
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Senior Member
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Join Date: Jan 2009
Location: North Yorkshire
Posts: 621
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Quote:
Originally Posted by IT
A8doc is right sadly, I considered the same.
If you have 4 Zone, then its a different hvac unit up fron that delivers cold only to the rear zone, which is then heated up as required using electric heaters underneath the front two seats under the carpet.
On 2 zone models, the rear ducting sends warm air at the temp corresponding to the front.
So you see, the ducts take air from different places, so it does require a lot of effort to make it work, otherwise if you fit 4 zone to a 2 zone car, the electric heaters will just warm up air that is already warm (when it should be cold)
and just in case you're still seriously considering it, then the HVAC unit upfront is a full dash out job to exchange, although I confess I've not looked closely enough to see if its possible to just modifiy the existing one in situ....
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Exactly as Ian says... I thought the same and then when I looked into the bits, it was a definete no no!
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