How to Add Freon to a Car Air Conditioner

by Editorial Team

When your car's air conditioner doesn't seem to be blowing cold air anymore, you may need to add Freon to the air conditioning system. Mechanics can charge hundreds of dollars to do this, but you can do it for much less if you know how. Learn how to add Freon to a car air conditioner by following these steps.

Step 1

Attach the recharging hoses to your system. The hoses from the gauges attach to the compressor of your air conditioning system. Attach the shorter hose to the can of Freon.

Step 2

Open the valve on the can for several seconds to purge the air from the system. Tighten the hose connection again and close the valve.

Step 3

Start the car's engine and turn on the air conditioner on HIGH. Allow the refrigerant to enter the system by slowly opening the valve for the low-side manifold. Make sure to hold the can upright, not allowing any liquid Freon to enter the system.

Step 4

Close the valve and remove the hose from the low-side fitting after the can is empty. Be careful when removing the can as there is still some Freon in the can.

Step 5

Repeat these steps if your system needs more than one can of Freon. Adding too much Freon is worse than not having enough and can damage the air conditioning system.

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