If you get hold of the missing outer clutch disc VW do a repair kit including nut and selection of shims - part no 1J0298912
Your compressor will probably be a Sanden. They seem to often dis assemble themselves.
There is a site carbasics.co.uk that is also useful.
Malcolm
Yes it's the Sanden type compressor. I've had a good poke round under the car and remember the name Sanden from the side of the compressor.
If you have the climate module fitted to your car, I believe you can use some secret code to get in the backdoor and get data from it.
One bit of data I think you can get is the RPM of the compressor ?
I guess this will ultimately tell you if the compressor is turning !!
Yes i have the climatronic (as Seat call it) display and have checked all the codes.
1. All temperature sensors read correctly, both indoor and outdoor.
2. There is Voltage to the compressor when i turn it on, and no voltage when i turn off the aircon so i know the wiring is just fine.
3. The high and low pressure switches are getting power and are working as required, showing a 1 when open, and a 0 when closed if i remember rightly.
4. The compressor RPM is always at 0 which upon further inspection is right because i am missing part of the clutch lol.
All i need now is to hopefully find a compressor clutch that will fit my car,
problem is a lot of people won't like to sell the clutch seperately i guess. I keep checking Ebay to see if anything comes up, but most seem to be the wrong part number as the letter at the end is always different to mine.
Thanks to everyone for their
help on this. I will dig out the part number i need and post it on here when i find it.