How to Add Freon to Car: 5 Steps for Recharging Your Car AC

If you want to learn how to add Freon to car, this step-by-step guide will show you how. You will also learn when you should add it and the quantity that you need to add.


Long summer drives can be excruciating if your car’s air conditioning isn’t working correctly. No one likes driving in hot weather, and if you can’t keep your car cool, it can be very frustrating.


That’s why learning how to add Freon to a car can come in handy if you’re constantly on the road and don’t have time to visit a mechanic. Because there are only two types of refrigerant that can be used in a modern car, finding one to refill your car’s air conditioning system shouldn’t be too difficult.


So, in this article, we’ll show you how to add Freon to a car and walk you through the process step-by-step.


When Should You Recharge Your Car AC?

If you notice that your car’s air conditioner isn’t cooling the vehicle as effectively as it once did, check to see if the refrigerant level is below the recommended level.


However, bear in mind that this is a rare occurrence, and you may not need to recharge the air conditioner even after years of heavy use.


The most common causes of air conditioning system failure are clogged filters, leaks, or damaged components. In other circumstances, the old refrigerant must be sucked out of the system before the new refrigerant can be installed.


READ: Causes and Solutions of Car AC Blowing Hot Air


How to Recharge an Empty Car AC System

Step 1: Find the service port on the low-pressure side

The low-side system service port, which is attached to the bigger of the two refrigerant lines, is the first stage in the charging process. This is one of two lines that emerge from the evaporator core (near the firewall) and lead to the compressor’s back. Because these positions vary and can be hidden on some vehicles, you may need to look around a little. The kit connector valve will not fit on the low side pressure port because it has a smaller fitting than the high side pressure port, which is larger.


The line of high side pressure is always smaller than the line of low side pressure. The recharge kit connector pushes down on the firm rubber ball valve on the low side service fitting to open and service the system.


Twist the cap counterclockwise to remove the low-side port once you’ve found it. An O ring should be on the top of the cap to seal it to the fitting. If you hear a leak when you remove the cap, this means the valve is defective, and it can be rectified by reinstalling the cap firmly or replacing the valve after the system is empty.


Step 2: Connect the Recharge Kit

Remove the safety tag indicated by a white or red plastic tag situated at the valve base to begin the charging procedure. To attach the connector, pull the connector retention ring upward and press down firmly on the low-side service port. To avoid confusion, the low-side fitting will not fit over the high-side port.


When trying to install the kit connector, it is normal to hear a small amount of pressure being released for a split second when the seal is being pushed onto the port flange.


Step 3: Read the system pressure

After connecting the charge kit, the gauge will display the system’s static pressure (engine off). If the system is flat with no pressure on the gauge, there is a leak that must be discovered and repaired before charging can begin, as we will discuss later in this article. The system in this scenario is just low on charge, as the indicator indicates. The needle should be in green for an adequate charge.


Step 4: Charge the system

Allow the engine to warm up to operating temperature by starting it and allowing it to idle. When the engine is cold, you don’t want to charge the system since the refrigerant pressure rises with heat, which might lead to overcharging.


Allow a volunteer to raise the engine’s idle slightly to assist in warming it up. This is also beneficial when charging the system and should be done until the job is completed and the kit is ready to be disconnected.


Turn on the air conditioner and set it to the coldest settings, including the highest fan speed, after the engines are running. This will ensure a full charge by pushing the machine to its limits.


Wait 30 seconds after turning on the system. The compressor should start working, and the pressure on the gauge should begin to drop. Turn the can upside down and press the plunger valve inward into the can, which will start releasing the refrigerant into the low-pressure side tube of the system as the gauge pressure rises.


Hold this position for a few seconds before releasing the plunger. When you let go of the plunger, the gauge will go up to show that the contents of the can have been moved into the system. Continue pressing and releasing until the system reaches the proper pressure as indicated on the gauge. Do not overfill the system; this will only make it colder than it is. In reality, if the system is overburdened, it will do the reverse and perform poorly. If the system is accidentally overfilled, the refrigerant must be drained off.


You may check if the system is fully charged with an infrared temperature meter, which gives you a correct reading immediately on the evaporator’s outgoing low-side a/c tube, indicating a full charge. You can also use your hands, although the tube will be quite cold.


READ: Best Air Impact Wrenches


Step 5: Unplug the charge kit

Release the connecting collar to remove the kit once the engine and system have reached their maximum cold temperatures. If you turn off the engine and let the system neutralize, the pressure will grow, making disconnecting the kit connector more difficult.


Pull the valve retention ring higher on the valve. The connector will be released, and the service port will automatically close. Reinstall the dust cap on the port after the kit has been removed, but do not overtighten the plastic cap.


Turn the ignition switch off to turn off the engine, which will also turn off the air conditioning system. Take advantage of the crisp air!


How Much Freon Does a Car Hold?

If you want to discover how much Freon your automobile can contain, you need to contact the manufacturer. In general, though, the answer is “one can.” This figure is dependent on how much space is left in the vehicle.


Because Freon is so uncommon, consulting a mechanic may be beneficial. They might be able to give you advice or suggest something better than Freon that is easier to use and better for the environment.


Wrapping Up

Even though adding Freon to cars isn’t a difficult operation, you must follow all directions to avoid further harm to your car’s air conditioning system. Hopefully, this post has assisted you in knowing how to add Freon to your car. Don’t forget to get the best Freon kit when you need to fill up your car’s air conditioning.

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