Golf GTi Mk2 1991 Air Con wiring issue

[Munch]

I have a 1991 Golf GTi with Air Con. I stripped down the heating system to replace the matrix and recover the vent flaps.

I notice there is a three pin electrical socket on the rear of the heater controls. (Vent direction) This is separate to the blower electrical connection.

I cannot find anything that plugs in bar a three pin black plug with Red/ white , Brown and blue/white coloured cables.

I thought this went to the cigarette lighter as it's permanent live.

Any help would be appreciated.

[Waspy]

It's not important I don't think, pretty sure it is just to illuminate the faceplate (which is nice I guess). But if I remember correctly, the plug which fits the back of the face plate is different to the plug for the cig lighter, so you sure you have the correct one?

[Munch]

I have the wires to the blower control fan, the two wires to the illumination but there is a third connector of three large blade pins, the other side of the control panel.

[Waspy]

Oh right, well mine only has blower and lights (non aircon), so it must be air con related.

I cant find a single picture of what a factory air-con dash set up looks like. Any pics?

[Munch]

I have pictures but am currently restricted from adding them.

[Waspy]

You should be able to link to a photobucket account or similar