I have a 1994 Porsche 968 and I can not find the lowside AC charge port. if you know where it is please post it.
You might want to also post this on a Porsche forum.
'94 was the year they changed from R-12 to R-134a…So that might be a consideration…(once you find the port…) Open the front hood and look just below fresh-air intake panel on the passenger side…
https://www.google.com/search?q=1994+968+porsche+A/C+port+location&hl=en&noj=1&tbm=isch&imgil=Ofth1g7yif7eIM%3A%3BkRscWrN10a3umM%3Bhttp%253A%252F%252Frennlist.com%252Fforums%252F996-forum%252F639419-help-refilling-my-a-c-where-hi-and-low-valves.html&source=iu&usg=__H0mpvfGEVeJxf4JWYnTk7WDJn1Y%3D&sa=X&ei=hWbpU9ThMYWxyATil4CIAg&ved=0CCEQ9QEwAA&biw=1024&bih=546#facrc=&imgdii=&imgrc=Ofth1g7yif7eIM%253A%3BkRscWrN10a3umM%3Bhttp%253A%252F%252Frennlist.com%252Fforums%252Fattachments%252F996-forum%252F544785d1308257452-help-refilling-my-a-c-where-hi-and-low-valves-0616111642.jpg%3Bhttp%253A%252F%252Frennlist.com%252Fforums%252F996-forum%252F639419-help-refilling-my-a-c-where-hi-and-low-valves.html%3B1024%3B768
Check with a Porsche forum or A/C DIY forum.
It wouldn’t surprise me if it doesn’t have a low side port. I’ve worked on Euro cars from the mid-90’s that didn’t have one. Audi specifically comes to mind.