Thank you very much for your postings on this issue.
My wife has a 1990 Golf Clipper mark 1 which has been off the road for a year. Prior to that, it only did 200 miles a year !! but it worked perfectly. Only 59,000 miles since new.
After an unexpected 12 month shut down, it started idling at 1,800 RPM. At first I thought it was the expansion element but, after reading your post on the front page, I felt the auto choke - stone cold even after 20 minutes idling (at 1,800 RPM).
Looks like the coolant channel is blocked. Repairing it is way beyond me so a visit to a trustworthy garage (we live in Cyprus so finding one who is familiar with Peirburgs is not so easy.)