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Sounds like a low Freon level. Did you say you tried to add Freon but it would not go into the system?
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This can be a tricky one. I need to know when you have the gages on and the engine off both side pressures should read the same and then start the car and then turn on the a/c does the low side start to dive lower and then go back up .
it is very critical of this test and readings .
please let me know!!
i do need a vin # please . i'm a 17 yr master vw tech . did you have the vehicle scanned for codes?
you will need scanner like vag com / vcds to scan a/c electronics to see if there are any codes. code readers will not do the job.
the valve on the compressor is controlled by PWM so with vcds it will tell you how much that valve is turned on and the torque of the compressor turning to verify if it is a valve or something else.
did you tap on the compressor near the valve when the a/c button is pressed on to see if the cooling changes?