How to add refrigerant in a 1987 Toyota Cressida?

To add refrigerant to a 1987 Toyota Cressida, first ensure the AC system is off and locate the low-pressure service port, usually found on the larger AC line. Attach a refrigerant can with a gauge to the port, then start the engine and turn on the AC to the maximum setting. Open the valve on the refrigerant can and monitor the pressure gauge, adding refrigerant until it reaches the recommended level. Be cautious not to overfill, and always wear safety gear to protect against refrigerant exposure.