low side on AC
Or the big line/ cold line is the low side... Smaller line is the liquid line/high side
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Also just because your A/C isnt working good now, it doesnt necessarily mean it needs to be recharged. By monitoring high and low side pressures you can diagnoise many other possible problems as well.
The smaller port is the low side(suction side) and the larger port is the high side(pressure side).
Not trying to sound like an ***, just trying to inform.



