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The low side service port for the air conditioning in a 2001 Ford F-150 can be found on the passenger side of the engine compartment near the tank, close to the firewall. Among the two ports available, the larger one is the low side. It's important to note that while recharging the AC system, the charging connector will exclusively fit the low side port, preventing any mix-up. A skilled technician may utilize the high pressure port with the system powered off, employing a vacuum pump to release all pressure in the system. The low pressure side is responsible for converting the refrigerant back to a liquid as it travels to the compressor for conversion back to a gas.
Typically, you can find the low side service port situated between the air conditioning compressor and evaporator.