Difference between high and low side

have a compressor taken out and disconnected.
which is the high side and the low side on a small frig compressors?

Plug it in with the caps off to test this, one will blow air out, this is
the high side, and two will suck air in the low side. If the compressor has
an oil cooler circuit the two lowest lines are usually for this. These are
hooked into the high side.

Without disconnecting a compressor, the low side suction line can be
identified as usually the largest line coming into the compressor.

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