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On a 1993 Oldsmobile Cutlass ciera air conditioning which side is high and low?

On a 1993 Oldsmobile Cutlass Ciera, like most vehicles, the high-pressure AC line is smaller in diameter and the low-pressure AC line is larger in diameter.

Look for the two lines connecting to the compressor. The smaller one is high pressure, and the larger one is low pressure. However, always double-check your repair manual or a diagram specific to your vehicle year and model for absolute certainty before working on your AC system. Incorrect identification can lead to refrigerant leaks and injury.