Could be a number of reasons. The reading could even be the result of a faulty gauge set. You need to have a system performance test done to pinpoint the cause.
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.
High side and low side refer to the pressure in the ac system. Ie The high side is the high pressure line and low side is the low pressure line.
LOW side
The low side will be on the accumulator and the high side will be on the discharge line.....
low side never charge from high side
The high pressure side being too low could be caused by a lack of refrigerant in the system, a malfunctioning compressor, or a problem with the condenser. On the other hand, the low pressure side being too high could be caused by an issue with the expansion valve, a blockage in the refrigerant lines, or a failure in the evaporator coil. It is recommended to have a professional technician diagnose and repair the problem to ensure proper functioning of the system.
The side of the membrane with a high concentration of solute is the hypertonic side, while the side with a low concentration is the hypotonic side. Diffusion will occur from the side of high concentration to the side of low concentration until equilibrium is reached.
In electricity? High voltage ,high currents. Low voltage, low currents.
clogged filters,dirty coils condensers,evaporators
High side, If you charge liquid on the low side it can cause the valves of the compressor to break.
High Side Small Diameter Hose, Low Side Large Hose. The High Side Runs Hot, The Low Side Cold. Best I Can Do With Info You Provided.
Low side.