How To Vacuum A Car Ac System

You will want to get cool air from the AC when you sit in the car. But suddenly he saw that it was not working. Then you will surely feel frustrated. Therefore, it is necessary to vacuum an air conditioning system to protect it from long-term damage or humidity. So how to vacuum a car Ac system?

Moisture in the car’s AC system is a serious problem. This is because moisture reduces the efficiency of the AC system and condenses the water in the AC system. Then the condensed water will erode the AC system. To solve this problem, vacuuming the car’s AC system is essential. In this article, we will tell you how to connect a vacuum to a car AC system. Keep reading the following article to know the formula for vacuuming processing in-car AC.

How To Vacuum A Car Ac System

AC is a sophisticated part of the car. So you need to vacuum to keep the AC system running and to protect yourself from any kind of corrosion. Regular use of vacuum pumps maintains a healthy AC system in the car. You may not know how to vacuum the car’s AC system here. So check out the following guide for direct information about the vacuum process.

Step 1

Make sure to bring a vacuum with you before vacuuming the car’s AC. If you don’t want to buy a vacuum permanently, you can rent one. Then turn off the car’s AC system completely.

Step 2

The car must have a nozzle visible. At the bottom of the nozzle is a service port that is attached to the compressor and evaporator. Once that port is identified you have to hook the manifold gauge. These gauge sets make it easy for the AC system to connect to low or high-pressure ports.

Step 3

Now connect the hose to the low-pressure port with the vacuum pump. This port is located between a gauge set of two gauges. This is very important in vacuuming the AC system. This is because it helps maintain the vacuum even when the pump is off. A refrigerant gauge can be added after maintaining the correct level of emptiness.


You then attach the red valve to the high-pressure port and the blue valve to the lower port. Moreover, the vacuum has a yellow valve that indicates the connection of the pump. Make sure the valves are closed before connecting the pump to the AC system. Otherwise, sparks may be created.

Step 5

Now let’s see how to pull the vacuum in the AC of an auto car. To do this, grab the right pressure port and lift the upward ring. Then push it down and attach it to the gauge. Simultaneously turn on the clockwise red valve so that the service valve at the bottom can be activated. Repeat the same step for the lower port in the same way.

Step 6

When all connections are saved and perfected, you can taunt the small valve or activate the internal plunger instead. This plunger port helps the valve to activate the refrigerant line. It is possible to vacuum the AC system without a pump, but it is not as efficient. So we recommend vacuuming with the help of a pump.

Step 7

Now it’s time to watch the vacuuming action. For this, set the riding of both gauges to zero first. Then proceed by adding vacuum to the other end of the yellow hose of the gauge. Now turn on the pump and track the vacuum pressure

In this case, it is appropriate to reflect up to 28Hg or aptly 29 inches. And this process will take some time to complete which is enough time to remove the moisture and dust inside the AC system.

Step 8

Next, open the valve at the lower port of the gauge for effective vacuuming. There is no need to apply low pressure when the vacuum expires. Now turn off the pump. Again, the ideal gauge pressure of about 26 to 29 inches. If proper pressure is not applied then there is a possibility of leakage. Conversely, if everything is done properly, you can then isolate the vacuum pump.

Step 9

That’s it. The process of vacuuming your car’s AC system is over. Now start your car and turn on the AC. Then slowly open the low-pressure valve of the gauge to ensure the constant flow of the refrigerator to come. Finally, put the cap and hood back.

How Long Does It Take To Vacuum A Car’s AC System?

This is a very common question that usually arises in our minds. This period will usually vary between 10 and 45 minutes. The duration will depend on the quality of your vacuum and your experience. Because if you can make the connections with the valves of the ports correctly and quickly then you will be able to complete the vacuuming process in less time.

Besides, if the quality of the vacuum is good, it can be pumped quickly. As a result, it will be easier and less time-consuming. If there is no leak in your pump then 30-45 minutes is enough which I said a while ago. A vacuum with a gauge pressure of about 500 microns or 29.92 Hg is suitable in this regard.

Additionally, a deep vacuum should be replaced with an AC receiver or dryer or strong accumulator that helps control the internal humidity of the AC system. Some people spend less than 30 minutes or more on vacuuming an AC system. Someone connected the vacuum for another 10 minutes and then opened it. In fact, it doesn’t take long for all car AC systems to be vacuumed.

How long it takes to vacuum your car will also depend on your judgment which you should know. For this, you can test it once in a while so that you don’t have to worry about time later.


There is no option to vacuum the car’s AC system so that moisture does not accumulate and spoil it. This removes all the dirt and harmful substances inside the AC which keeps the AC system running for a long time. So vacuum the car’s AC system by following the above process and enjoy the AC service. Protection Status
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