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They may be marked "S" and "D" for suction (low side) and discharge (high side).

A simpler way would be to look at the lines going into and out of the AC.... the smaller line will be the high pressure line, while the larger line will be the low pressure line. The low pressure line will connect at the compressor inlet, and the high pressure line will connect at the compressor outlet.

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Q: Which port on AC compressor is low pressure 1999 Chevy blazer?
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