Thanks, the label on the core support shows 525 +/- 25 g so 18.5 +/- 0.9 oz and confirmed with the factory repair manual with the same information.

Ok so a possible control valve issue, and not a blockage or restriction or issue with Txv?

Vw 2008 Rabbit/Golf

Ambient temperature 80F

Variable displacement Pxe-16

Charged with 18.5 oz R134a which is spec.

Static pressure at 80F was approx. 80 psi lo/hi

The reading at idle and 80F 35psi Lo & Hi

The reading at 2krpm low side 42psi to 20psi & High side some 25psi-50psi

yes it blowing cold and then goes warm and goes back to blowing cold.

What is the typical time for pressure to equalize after shutting down ac system. I am seeing 4-6 hours before they do which I think is to long, any idea what could be the cause. Thanks 2007 VW Sanden compressor.

Thanks for the responses. So as I am understanding the posts made here the cap it to protect the valve core and prevent small leaks that might get passed the valve core but will not hold back the pressure of a complete valve core failure.

Thought I ask this question here because you people have have always been helpful and know you stuff. What is the primary sealing device for the service ports? I believe that it would be the valve core and it seals and that the service port cap is to protect the core valve from any damage & dirt...

Got it thanks again

Is it legal to add a few oz of R134a to an empty system to try to locate the leak/s with a sniffer.