[Bluestream]

Your AC system has no Freon, it uses R134a. I would suggest your compressor is worn to the point where it can no longer produce the head pressures needed to perform properly. If your AC shop said "we don't know about the Beetle system" then go somewhere that does. Any shop should know how to fix this, the systems all work the same. They must be clueless.

You may want to try an HC12 gas in the system, as it is about 40% more efficient than R134a, and is not a greenhouse gas like R134a. Or pony up for a new compressor