How to Add Car Refrigerant?

[OJulianna]

After the system is vacuumed, close the high and low pressure manual valves on the manifold pressure gauge. Connect one end of the middle hose to the joint of the refrigerant can injection valve. Open the high-pressure side manual valve to the fully open position and invert the refrigerant can. Inject the specified amount of liquid refrigerant from the high-pressure side.

[DeBennett]

I've seen many people refilling refrigerant by themselves, which can be both simple and troublesome. Remember to start the car and turn the air conditioning to the maximum cooling setting—never operate with the engine off. Locate the low-pressure port labeled 'L' in the engine bay and clean the connector. Buy a can of refrigerant with an adapter hose, connect the hose to the port first, then slowly open the valve on the refrigerant can. Listen for the hissing sound and don’t rush—follow the recommended amount on the can, as adding too much can actually reduce cooling efficiency. Before closing the valve, quickly disconnect the hose to prevent gas leakage. Finally, check if the air vent temperature has dropped. If you're unsure about the refrigerant type or suspect a system leak, I recommend visiting a professional shop for a safer and easier solution.