1998 Oldsmobile Cutlass NEED TO REFILL THE COOLANT

Purchase a refill kit at a local auto part store, it should look similar to pic below. Be sure it is R-134a refrigerant. You will hook this kit up to the low-pressure valve which is on the evaporator-to-compressor line, near the evaporator. Use the gauge that is made onto the kit bottle. If it's low then start shooting some into the system. If it's too high or is just right but is still not cool then an HVAC tech should make repairs to it accordingly.