Can you use r134A refrigerant in a 2000 Toyota 4Runner?

No, you cannot use R134A refrigerant in a 2000 Toyota 4Runner, as it is designed to use R134A. However, if the system has been retrofitted for R1234yf, then that refrigerant can be used. Always check the specific requirements in your vehicle's manual or on the manufacturer's label before making any changes to the refrigerant type.