A/c

[DRACO A5OG]

I would check couple of things:

Schrader Valves, after refill, check to see if they are leaking, touch the tip of the valve needle, if you move it a bit nad hear a leak, you need to tighten it, if is still leaks, you need to replace them.

The other is, you listed everything but the hoses, are they the original barrier hoses or?

[Porsche 935]

Mine is exactly like the picture. And the access ports look like they are removable. There appeared to be a very slight leak from the schrader valves but not with the caps on and since they did show leakage I want to consider replacing them. The barrier hoses from the looks of them appear not to have been replaced, the crimps look old and rusty but can not find any leaks. I guess they could have seepage. I have not had the car that long, so trying to fix the many issues it came with. One hose from compressor to condenser looks new but the receipts do not show any hoses under the parts purchased section.

[T77911S]

you have to check the entire hose.
mine had a hole around where it passed the rear sway bar

[zippy_gg]

Originally Posted by Porsche 935

The barrier hoses from the looks of them appear not to have been replaced, the crimps look old and rusty but can not find any leaks. I guess they could have seepage.

This would indicate you still have the factory non-barrier hoses in place.

[kuehl]

The schrader valves can leak for several reasons:
A) Debris in the system preventing the valve to seat.
B) Service coupler bent the valve.
C) With R134a adapters that have their own schrader, failure to remove
the old R12 schrader underneath.
D) Mfg defect

After you have charged a system the standard procedure is sniff the valves with your electronic leak detector, or you could place a dab of refrigerant oil over the hole and check to see if there is bubbling. Its common to have some residual refrigerant in the service port entrance after charging or testing a system.

The protective dust caps that cover the R12 or R134a service ports are simply
"protective dust caps". Their function is not to prevent leaks.

Barrier hoses will have the appropriate SAE specification or the word "barrier" printed on them