1993 Other Oldsmobile Models air failing

There are two sensors, one on the high and one on the low side. You need to hook up a set of guages to the system, unplug the low pressure cycling switch, located usually on or near the silver cannister(accumulator) and jump the leads, this should allow the compressor to run. If the readings are 25-35 low and 175-225 on the high side, your system should start to cool. Replace that low side switch.