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Update. the car runs normally just below 70 degrees If I get stuck in traffic for a while. Heavy traffic not moving, then the car goes up to 90 but not above. Took the car for MOT and look at the temperature. £360 for the thermostat. Decided to leave it for a while as it isn’t a big problem.

Dear SteveQ and Spartacus, many thanks indeed for your quick responses, I really appreciate them and your advice. I've emailed A S Pickering, a specialist roof repairer and they say it needs a complete roof replacement, but I'm not giving up yet, I don't wanna waste 5 grand on it if just the window can be replaced. I spoke with the insurance company yesterday and I'm really annoyed because when you enter your reg for a quote it comes up Audi A3 Cabriolet. But there was nothing to sat windscreens aren't covered on convertibles! It's in the small print and you only see this once you have committed to buying the insurance! So I'm gonna pursue this as well, maybe with the insurance ombudsman...probably not worth it but gives me something to do. Cheers for your help guys. Pete

Allow me to put my chemist's hat on again. Silicones are the best thing for plastics and rubbers because they do not soften or dissolve them, unlike mineral oils, however they are much more difficult to remove than mineral oils. If you have ever smeared silicone mastic on a glass shower door it will be forever water repellant.

I'm sure a specialist trimmer can fix. If the rest of the roof is in good condition, then you would need to source glass and have it glued in. They will likely need the car for a couple of days. There are a few second hand convertible units I've seen, but to be honest they have grubby headliners, and you've no idea if the mechanical side works give these parts are pretty niche anyway and how long they have been sitting in a warehouse somewhere. Double check against here: https://www.lllparts.co.uk/catalogs/audi/RDW/A3CA/778/8/871/871000 From what I can see - replacement glass won't be available from Audi - but you might be able to obtain via Saint Gobain/Pilkington who produce glass units for manufacturers. It will have integral antenna (GPS/radio), green tint, heated, etc. Read a couple of threads where Bolton Interiors were mentioned. Worth a call.

Have you tried eBay for a second hand window or roof? The window is only bonded and stitched in place. Have you spoken to your insurance company regarding window replacement?