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Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here. Providing the system is full and the pressures are correct then in order to determine why the compressor is not engaging you are going to need to do some testing. I have enclosed the steps in the link below.https://dl.dropboxusercontent.com/u/104923897/Compressor%20clutch%20Jul%2030.pdf
The post time out over time . I have reposted it. Be sure to print it out so as to not loose it.https://dl.dropboxusercontent.com/u/104923897/AC%20VW%20clutch%20AUg%204.pdf
You can ready a duty cycle by using the AC mode on your meter.
which plug are you checking?
Okay then it needs to be plugged in while testing
Are you working on a manual Ac system or is this an automatic. I look you up a wiring diagram. Let me know.
Yes that would be correct , see the system wiring diagram in the link below to see if this will help you trace the open .https://dl.dropboxusercontent.com/u/104923897/VW%20AC%20Aug%206.pdf
If you checking a ground you should not be reading any voltage on the ground circuit.
The AC compressor will normally cycle off and on during normal operation to avoid the system freezing up.
What type of help are you needing, I am limited with what I can do from here.
The system is designed to shut the AC compressor off during wide open throttle operation to cut the load on the engine.