You add refrigerant through the low side port. There is a web site www.idqusa.com that will tell you were the port is located on a 96 grandam, along with much more helpfull information.
The small connector in the a/c line is the low port and the big connector is the high port side ...
if one side flashes faster than the other, it's either a bulb out ob the fast side or the flasher (located under the dash on the drivers side)
You are on the wrong port. Some fords have an extra port that the low side hose screws on but is a high side fitting. look for another port.
It should be under the car on the drivers side frame rail under the rear seat.
The S port is the Suction and its the low side. The D stands for Discharge and its your high side.
It is under the dash on the left side.
It is under the dash on the left side
The port next to the radiator is the low-side port
The 1986 Nissan King low side port can be found on the air conditioning compressor. The low side port will be labeled as the high pressure port.
The port with the black cap on it is the low side as the red cap is the high side.
Low side is the suction side and will have the larger hose attached to it and the high side is the discharge side and will have the smaller hose........