The Accumulator.
The smaller port is the Low side port.
On a 1993 Lincoln Town Car, the low side AC service port is typically located on the larger diameter AC line, which runs between the compressor and the evaporator. It can be found near the firewall on the passenger side of the engine compartment. To easily identify it, look for a cap that is usually colored blue or black. Always ensure the engine is off and the system is properly depressurized before attempting any service.
It is in the engine compartment, drivers side on the wheel well.
Believe it is near the compressor
there are 2 ports on your vehicle, high and low, you need the low which is the port side and its usually the bigger of the 2 ports, just follow your ac lines to each one, one will be bigger than the other, the bigger one is your port side where you put the r-134a. hope this helps.
On the side of the receiver dryer. You can find a diagram of this on the below link. Just follow the "Find your low side Port" icon.
Under dash
it is located on the back of the throttle body driver side position
Felixtowe is a large port in its own right.
Bank 2 is the drivers side of the engine in your Lincoln Town Car
Refrigerant is added through the low side service port. That is the smaller of the two fittings on the ac lines.
thel ow pressure side on the ac system is the biggest valve ( which is the blue one ) the other is smaller ( red ).