R12 -> R134a 1989 Porsche Kit Questions

[Dougflas]

Thanks Tim and Cusser,
It looks like HNBR O-rings come in black or green.
They may not be exactly the same (e.g. different durometer)
https://www.globaloring.com/oring-colors/

I guess I'll assume the QD fittings for R134a will be OK.
It makes sense after all this time at least the R134a fittings should have compatible O-rings.
I might try putting some teflon tape on the threads as a belt and suspenders approach.

When was the last time you saw Teflon tape on a vehicle AC fitting? I think you're making this a bigger deal than it really is.

[Cusser]

I might try putting some teflon tape on the threads as a belt and suspenders approach.

Teflon tape is used to help seal tapered pipe threads. It won't help your O-ring connection to seal, but "might" help you unscrew the fitting in the future.

[HC3]

The teflon tape isn't near the O-ring just on the adapter threads. The idea is if R134a leaks past the O-ring it might be stopped by the teflon tape.
I'm well aware how the tape works on NPT threads.

[Cusser]

The teflon tape isn't near the O-ring just on the adapter threads. The idea is if R134a leaks past the O-ring it might be stopped by the teflon tape.

Better off buying lottery tickets.....

[HC3]

Another annoying question.

Is there better Schrader valve and cap adapter assemblies out there I should get before doing the evac. and charge?
The Schrader valves look to be the standard type. The caps are plastic with a black O-ring or seal inside.
It seems that brass caps might be better. Thoughts? Thanks.

[Cusser]

Why do those caps have holes drilled in them????

[HC3]

They came that way - I had the same question.
I'll take a closer look to make sure the holes don't go thru.
I think those "holes" are to get a more constant wall thickness for the center part of the cap that has the male threads that thread into the top of the fitting.
It helps with the molding process.

[HC3]

Holes don't go through (thru) , it seems they are there for the reason I mention.
Still, should I look at finding better converters that have bigger Schrader valves and/or brass caps?
Thanks.

[Dougflas]

I have never seen brass caps for R134a either factory or replacement. You can get them for R12 systems thru HVAC supply stores.

[Cusser]

Still, should I look at finding better converters that have bigger Schrader valves and/or brass caps?
Thanks.

No; you worry too much.