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
In a 1985 Celica Supra, the high side and low side air conditioning lines can be distinguished by their size and location. The low side line is typically larger in diameter and is usually located between the evaporator and the compressor. In contrast, the high side line is smaller and runs from the compressor to the condenser. Additionally, the service ports for the high side and low side are usually marked, with the low side port being accessible for filling refrigerant.
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.
clogged filters,dirty coils condensers,evaporators
In electricity? High voltage ,high currents. Low voltage, low currents.
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.