[s-cars] Location of 'Low Side' AC service port -- 94 S4

[Gary Meier]

I've looked high and low and can't find the 'low side' service/charging
port on my 94 S4. A good general description of its location would be
helpful; a photo would be even better. It's getting hot here and the AC is
slowly going away. All I need to do is find the port to have cool sailing
ahead.
Thanks in advance for any and all assistance.
Gary Meier