I removed the lower right (on a RHD car) cubby, because I dropped one of the screws, if you need to do this, flip it down and push a screwdriver along the sides as you pull on it to release the stops at the side, it will simply pull off after this.
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The next part is probably the most tricky, the cable which is already attached to the new loom is for the RIGHT SIDE. Feed this down where the existing cables come from, then up through the back, I used one of the vent holes as the plug passes through here easily. Next feed a scrap wire or piece of string down from behind the cluster, until it appears down the back of the infotainment unit, it will take some fiddling but it will get there. Tape this to the plug and draw it up behind the dash, then feed the wire/string out through the right hand side and connect to the sensor. That's the Right hand side complete.
The left side is a little easier, look in from the left of the dashboard with the door open and you'll see a clear and straight path to where the light is coming in behind the infotainment unit. Take the thin wire for the left sensor and put a little tape round the 2x metal pins on the end of the wires. straighten this and feed it along towards the light until it pops out behind the infotainment unit, again feed it down behind where the existing wires come from and remove the tape (the tape just stops the pins splaying out and getting caught).
The 2 pins go into this connector, you'll see little numbers printed on this side, 1 to 20. We're looking for pins 13 and 17 which are on the right hand side in the picture.
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You have to slide the connector out of the housing, do this by pulling the little tab shown next to my thumbnail and the wire block will slide out.
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Insert the 2 pins until they click into the connector, reassemble the connector.
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Plug in the 2 plugs on the adapter harness to the back of the new climatronic unit and then plug the single plug into the socket as shown.
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Finally plug in the main plug on the right (no picture) and physically clip the climatronic and infotainment units back into place.
Turn on the engine and check that the unit powers up and that you can turn the fan speed up and down etc.
Run a 'Flap resync' which trains the new clima unit to the flap positions of your heater box, do this by pressing the AC and dash vents buttons symultaneously until their lights start flashing back and forward. You might hear the flaps moving etc and after a few seconds it should go back to normal.
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Run an AC 'Run-in' (sync) cycle by pressing the AC and "Max Demist" buttons symultaneously until they start flasing. Again this may take a little while as the clima unit trains itself to the AC compressor.
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After this everything* should work. Before runninng the AC sync, my AC wouldn't turn on, the light wouldn't light up and it wouldn't get cold. You can also run these from VAG-COM if you have it.
*The one caveat with this mod is that you don't get dual zone control, only 'Sync' with both zones at the same temp. This is because you're missing the flaps which direct air to the left and right of the car, but the main thing is the climatronic function works. If this bothers you then the only solution is to rip out the dash and fit the correct heater box and flaps. It doesn't bother me in the slightest. Also 'Clean air' function won't work if you don't have the air quality sensor installed. Again, not an issue for me.
Final step, put everything back together and enjoy.