Verify the AC system is low on refrigerant with a gauge set
Identify the correct refrigerant type from the vehicle label or manual
Gather the proper recharge kit, manifold gauges, and safety gear
Turn off the engine and locate the low-pressure service port
Attach the recharge hose to the low-pressure port only
Start the engine and set the AC to maximum cooling and fan speed
Check the gauge reading before adding refrigerant
Shake the refrigerant can if required by the product instructions
Open the valve and add refrigerant slowly into the low-pressure side
Monitor the gauge and stop when the system reaches the recommended pressure
Avoid overcharging the system
Disconnect the hose and replace the service port cap
Test the AC for cold air output and proper operation
Inspect for leaks if the system loses refrigerant again
Have the system serviced by a professional if cooling does not improve