How to recharge car ac after compressor replacement

How to recharge car ac after compressor replacement

How to recharge car ac after compressor replacement? Compressor diagnostics is a simple process that can help you determine what might be causing the problem. Before the compressor fails, it may show signs of not working properly. Now that the compressor is damaged and you got a replacement, recharging car ac after compressor replacement might be challenging for you.

For you to recharge car ac after compressor replacement, you should locate the low side service port, which is mostly at the left side for modern cars, wipe away dust around it, attach the charging hose, add the r134a refrigerant, charge the system, take the air pressure reading and remove the charging hose to complete the task.

For you to carry out the task effectively, you need to have the right equipment or recharge kit. You can always get them from any online or local store. You must choose the right and quality one for effective results.

Ac recharge kit

How to recharge car ac after compressor replacement

The Ac Recharge Kit is the perfect tool to recharge the refrigerant in your car’s air conditioning system. The kit includes a recharge hose that connects to the ac port of your air conditioner and a can of R134A refrigerant. You can get refrigerants from any store such as Walmart and Amazon.

So, there are different types of ac recharge kits that you can come across in the market today.


In the 1930s, air conditioning in automobiles was first available as an aftermarket option. Until 1939, the first automobile manufacturer began to offer it as an option, with others rapidly following the trend. R12 was the first refrigerant used in automobiles. They are still available on a limited basis for drivers older than 1995, but restrictions will make them completely illegal by 2020.

R134a recharge kit

A new air conditioning refrigerant was developed as emission concerns became more strictly regulated. For the last two decades, r134a recharge kits have been used in automobiles. These systems are far more efficient than their forerunners. They are also less likely to leak, which benefits the environment and saves you money in the long run.


It will be impossible to recharge your air conditioning without any of the proper equipment. To refill the coolant, you need a hose to connect the Freon to the low-pressure port in the engine compartment. Some of the best r134a recharge kits include a hose, while others require that you purchase one separately.


Freon is the most important component of an AC recharging kit. This is the chemical solution that your air conditioner uses to generate cold air. Freon is a brand name for the organic compound chlorofluorocarbon. Most kits deliver the solution to your AC unit via an aerosol can or a pump.


A pressure gauge may be included with the canisters containing the refrigerant in your AC recharging kit. It is a fantastic tool for both application and storage. The pressure gauge will tell you how much refrigerant you have in the compressor and when to stop to avoid loading it too much.

How to charge car ac with manifold gauges?

How to recharge car ac after compressor replacement

One of the ways you can charge your ac is through the use of manifold gauges. You can always get the right one from Walmart, Amazon, or any other local and online stores.

So, to charge your car ac using a manifold gauge, you should follow the instruction below.

If you are using the manifold gauge, the first thing is that you should get one from the market. Also, you will need a refrigerant, and you can consider the R134a as two of it should get the task done effectively. Also, you might need a scale that will help you monitor the air that goes into your compressor.

Not all refrigerant comes with a digital scale or gauge, and that is why the use of manifold gauges is the right application to recharge your car’s ac compressor. Before you start anything, you should have your safety glove on your hands and your goggle on your face.

You do not want anything to get into your eyes during the process. So, you need to give all attention to whatever you are doing,

To charge your ac with manifold gauges, you need to put a vacuum on the whole AC system to draw out any air or moisture in the compressor. You should not skip this step as it is important to ensure you get the recharging done rightly.

How to charge car ac with manifold gauges? Connect the manifold gauge to the ac system and ensure that the valves are closed and not opened. The left side is the low-pressure side of the gauge, while the right side is the high-pressure side.

You will identify them by their color. The low always come in blue color while the high comes in red color. The middle is where you pull the Vacuum and add the refrigerants later. You must know the low-pressure gauge only fits on the low-pressure side and the same with the high one. You can’t mix them up because the size is not the same.

To connect the gauge to the low-pressure side, you just need to push and slide it into it, and the same thing for the high-pressure side. Once you have done that, you should open the low pressure and the high-pressure side.

You should check the gauges of the low and high and ensure they are on zero reading. It has to be zero to show that there is no pressure since it is a new one. The yellow line, which is in the middle, will be connected to the vacuum pump.

Once you are sure you have all connections in place, you can switch on the vacuum pump. You can then open the valves, both the low and high, and then you see the effect on the low the needle moves down on the gauge.

After you have done that for a few minutes, you should close the valves and the Vacuum. You should leave for some minutes, and you need to confirm if the low-pressure gauge can stay at 30 inches of mercury. If it does, it shows that the system is right and no leakage is in place.

Once it remains at 30 inches of mercury after some minutes, it shows you have a good AC system and can move on to the next task. So, you should switch on the Vacuum again while you open the valves of the low and high to get rid of air and moisture in the system completely.

After some minutes, you can close the valve and shut the Vacuum. The next step is for you to add the refrigerants. If you are replacing a major component in your AC system, just like your compressor, you will add oil to the system.

The role of the oil is to lubricate the compressor and ensure it doesn’t run dry. You can add the oil into the yellow line to get it into the compressor. Get your adaptor and connect to the refrigerator can. Once you have done that, you should connect the yellow line to the adapter on the refrigerant.

You should screw down the pin on the refrigerant to allow the gas to get into the line. You need your valve to be closed while doing this. So, you can open the refrigerant. Start the car and make sure the AC is on, and put the fan on low.

So, with the AC on and the fan working, you can go on to add the refrigerator. Next, you should open up the low-pressure valve on the manifold gauge and see the pressure going into the system. Once you notice the can is empty, you can remove it and put another one.

You should close the low-pressure valve on the manifold gauge before disconnecting the valve. You should give attention to the level of the refrigerant that you use. You should not overload the compressor. So, using a scale will help you measure the refrigerant.

Once you are done with getting the refrigerant into the system, you should disconnect all lines and then cover your AC system’s low-pressure side and high-pressure side with their cap. That is all about charging your car ac with manifold gauges.

How to recharge ac in car (r134a)?

How to recharge car ac after compressor replacement

When an AC is leaking, the refrigerant in it escapes out of the system. It is important for this refrigerant or oil in your car to be replaced or refilled promptly. The cost for this service varies depending on your location, but generally, it is cheaper to do it yourself.

You can make use of r134a to recharge your car AC. The process doesn’t take longer than you might imagine. All you need to do is to get the refrigerant. Most of the r134a comes with the hose attached, while the setback is that they don’t come with a gauge to measure the level of refrigerant you are passing into the compressor.

The best thing to do is to measure on the scale before doing any recharging. Measure the r134a refrigerant and check the compressor requirement to know the number of refrigerants you need to use. Once you are sure, you should locate the low-pressure knob of your AC system.

Open the cap and insert the head of the hose of the refrigerant and then screw in the top of the refrigerant to release the gas into the compressor.

Do you charge ac on the high or low side?

You can charge on the high and low. However, I would recommend you charge it on the low side. If you do that, you are prolonging the life of your ac unit because there are fewer chances of damaging your compressor.

Many cars are charged on the low side. It is because it’s easier to use the low-pressure side for automatic systems. The high and low sides refer to the airflow direction and amount of pressure produced if correctly adjusted. The benefit of charging an air conditioner on the low side is that you get better cooling at maximum pressure while reducing wear and tear on your air conditioning unit.

How to charge an air conditioner?

There are two ways you can charge the air conditioner system in your car. You can make use of the manifold gauges, or you do it directly using the refrigerants. The good side of using the manifold gauge is that it helps you keep a close tab on the process.

It helps you know the level of gas you are sending into the compressor, and with it, you get to know if you are short or full of gas. However, you have to trust your instinct with the refrigerant because most do not come with gauges.

However, you can have a successful recharge if you have a scale to measure your refrigerants.

How to purge air from car ac system?

Purging air from your car’s A/C system is necessary when the system becomes filled with moisture that could cause problems. The purpose of the ac system is to put a vaporized liquid into a small space. This liquid turns into a gas and goes through a small tube that forces the gas to be pushed out of the tube to make you feel cold.

There is a certain amount of air trapped in the system when the car is sitting still because it cannot go out. This causes the ac to freeze up and overwork as it tries to keep up with removing excess air from the system.

So, this tells you the importance of purging the air from your ac. How then can you do that? The only way I get to do this is through the coolant hose. All I have to do is open the coolant cap and expose it. Then I add a funnel into it to prevent the coolant from spilling.

Once I am sure of the fitment of the funnel on the coolant opening, I go ahead to squeeze the coolant hose or pipe, and then you get to see bubbles or air come out while the coolant level rises in the funnel. You do this for several minutes until you are sure there is only minimal air in the system.

After that, you can switch on your car and ensure the fan is on with the AC system to regulate the system.

Can you Charge ac without Vacuum?

Yes, you can always charge your ac without a vacuum. Most people do that regularly, but it has been one of the major reasons for the damages to some AC systems. The Vacuum plays a great role in ensuring the AC system is free of moisture that could damage the AC system.

If moisture is not evacuated, the acids formed by the high-temperature reaction of refrigerant and moisture will destroy the condenser, evaporator, compressor, and control valves in the system and any aluminum lines.


You must recharge the AC system of your car once you get a new compressor. I have this page devoted to how to recharge car ac after compressor replacement, and I hope you sure find it easy to do with the information I have on this page.