How do you recharge air conditioner on 2002 gmc envoy?

To recharge the air conditioner on a 2002 GMC Envoy, first ensure the vehicle is off and locate the low-pressure service port, typically found on the larger refrigerant line. Attach a refrigerant can with a gauge to this port and start the engine with the AC on max. Follow the instructions on the refrigerant can to add the refrigerant, monitoring the pressure gauge to avoid overcharging. Once the desired level is reached, remove the can and replace the service port cap.