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The big port is the low pressure suction side little port is high pressure, You would need a set of a/c gauges for R-134a and you can check the pressures with it running typically the low side should be around 20inhg and high side can be anywhere from 200-325 and I am not sure of ford specs but typically that's the pressure ranges, or you can vac the system down and recharge as there should be a tag stating the amount of charge.
If you have access to a uv light the system should already have the dye in the system.
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