AC Air conditioner Refill High Side Port

[Mx3forever]

Searched and searched, in the engine bay, online and here.

1993 MX-3 Originally R-12 (until a line broke 10 years ago).

I've replaced some AC components and now I'm in the middle of vacuuming out the system.
The directions i've seen would have me hook the manifold gauge up to both Low and High sides of the AC system.
>I've looked and looked and I don't see any High Side port.<

I also have an older Miata and I saw in a post someone mention something about these R-12's only Having One Port.
The drawings of the system I've seen only showed one port as well.......

Do these older R-12 cars only have One Port?

Hopefully this info will help out the next guy, right now I've pulled a vacuum on the low side and I'm waiting on the pressure test.

Thanks

[MX_Sid]

All right, I know you have probably figured it out already, but for anyone who checks in the future...

I had to learn all about A/C years ago when I installed one in my MX.

The LOW pressure port is located between the passenger side firewall and the compressor. The line runs along the passenger side fender ov the engine bay.

The HIGH pressure port, downstream from the compressor, is located on the firewall above and to the drivers side a little from where the A/C lines pass through the firewall on a silver square-ish piece. The HIGH side line follows the firewall, has a mounting bracket that attaches to your drivers side strut mount, and wraps around half the engine bay on the driver side.

Hope this helps. Good luck.