928s4 AC snaffu

[Gaspowered]

Is there an R134a conversion sticker under the hood anywhere?
As @dr bob and @Tom have mentioned, it's a pretty good bet your system has been "converted".
I use quotations because of the sealant putty on your Drier.
What that kind of tells me is that there may be a good chance the o-rings weren't changed out for the proper green ones.

If you unscrew the blue cap, the fitting should look like this.

Screenshot_20260416_154556_Chrome.jpg (275.91 KiB) Viewed 32 times

The red cap should be on the compressor.

Cheers

[spacecad3t]

Interesting, I look much closer.