How to Vacuum Car AC System Without Pump

If the AC system is not cleaned, the effectiveness of communication would be ineffective. There remains a minimal volume of cold, moisture, or water that ignites the cool refrigerant inside the air conditioner. Thorough vacuuming can keep the air conditioner at a comfortable temperature.

People ask if it is advisable to vacuum the AC system. Yes, this is very necessary. Moisture in the air conditioner can be replaced by vacuuming the air conditioning system. This seems to be a major problem. Moisture, as we all know, is a serious problem that decreases the capacity of the AC. Water, on the other hand, has the potential to freeze the AC device. In addition, air creates a strong condensation effect at the edges of the cooling system.

How to clean the car air conditioning machine without a pump? Before going into the details of this answer, we suggest that you monitor the vacuum pressure and set the vacuum pump to 29 inches of mercury (Hg) whenever possible. A half-hour vacuum treatment within the air conditioning system will remove moisture and dust from the machine.

If you do not want to use a vacuum unit, you should install a check valve on the top and bottom sides of the AC device. This can help you vacuum the AC device without the need for a compressor.

Steps to Vacuum Car AC System Without Pump

Step 1: Depress the AC system’s access valves.

The first and most important thing is to mount the maintenance valves on the high and low-pressure sides of the compressor. The next task is to press the maintenance valve on the high-pressure side and determine the compressor pressure on the low-pressure side. The voltage will rise to the high-pressure side valve, which will shut down the compressor.

Step 2: Charge the low side valve

Did you notice the result of the first step? The low-pressure side of the air conditioner should now be set to 14 psi. Running the friction for a few minutes will equalize the pressure on the high and low sides.

Step 3: Disconnect pressure from the high side valve.

I hope you have been effective in pressurizing the high and low-pressure side valves. Make sure that the stresses on both service valves are controlled. The compressor can now be rotated behind the service valve and effectively pressed against the high valve. Cover the high-pressure valve and compressor until the low-pressure side has reached operating pressure.

Step 4: Load the low side once more and turn off the high side valve.

Now, for three minutes, you must constantly adjust the machine pressure to 14 psi and equalize the pressure. Next, you need to “turn on” the compressor and press the valve on the high-pressure side. There is no doubt that you will see a successful difference, as the lower end of the device does not reach the lower end of the previous version. If during this operation no steam, air, or moisture comes out of the high maintenance valve, close the valve. The vacuum mechanism is almost completed by the AC system without a pump.

Step 5: Finally, fill the AC system with refrigerant.

The last step is to pump the refrigerant into the air conditioner. The amount of refrigerant required is specified in the instruction manual or user’s manual. Turn off the compressor after introducing the refrigerant into the AC system. Depending on the organization, you may need to make additional changes.

How to Vacuum Down and Recharge an Air Conditioner?

You have two options for charging your car’s air conditioner. The first method involves introducing a small volume of refrigerant to charge the system, while the second involves injecting a vacuum and charging from the ground. However, since the second alternative requires the use of a vacuum pump, it will not be discussed in this report.

Failure to clean dust and moisture from inside the AC system may affect the performance of the apparatus. Instead of waiting for a crisis to arise, you can vacuum on a daily basis.

In fact, most manufacturers suggest that you clean the machine after each operation. This helps remove residual moisture, thus extending the life of the compressor.

Follow these steps to perform a quick refrigerant recharge of your vehicle’s AC system.

  1. Safety instructions. Until it is time to start the car, park it on a flat surface with the engine off. In case of emergency braking, stop at the gearbox and wear safety glasses and gloves.
  2. Purchase a basic charging package. It can be purchased from your nearest car dealer.
  3. Remove the valve seat protection mechanism before starting the engine.
  4. Find the low-pressure side device service port on the larger of the two refrigerant sides. These positions can change and blur.
  5. Remove the dust cover from the low-pressure side service port until you have located it.
  6. Pull up on the retaining ring when pressing the valve into the inlet port. It is important to remember that the low-pressure side connector would not work on the high-pressure side port. This tends to avoid misunderstandings.
  7. After installation of the replacement kit, the pressure gauge would show the state of charge on the low-pressure side of the system.
  8. Start the engine after securing the kit, and turn the air conditioner on at maximum level, including fan speed.
  9. After waiting 30 seconds, the compressor will start running. After this, there will be a pressure drop.
  10. To allow the refrigerant to enter the unit, press the plunger valve inward. Then release it. The pressure gauge will rise, indicating that fluid has been transferred from the can to the reservoir. The pressure gauge will decrease again after the plunger is released.
  11. Repeat this procedure until the device pressure is correct. This will show on the gauge. Do not overfill the canister.
  12. As the pressure increases monitor the temperature of the evaporator outlet tube and the passenger cabin breather ports. Both may feel cold to the touch.
  13. Turn off the ignition. This can shut off both the air conditioner and the pump.
  14. To release the unit and cover the service port, pull up the base charge pack bracket.
  15. Replace the service port dust cover.


Does vacuuming your AC system remove oil?

You may be curious to know if draining the device requires replacement of the PAG gasoline. A vacuum cleaner cannot remove oil from the system. It should not be necessary to inject oil until the accumulator or compressor is disconnected.

Do you have to vacuum an air conditioning system in a car?

To avoid complications caused by air or moisture in the A/C line, consideration should be given to installing an evacuation device in the vehicle in addition to the house.

In addition, air or moisture in the vehicle air conditioning device can always be evacuated before charging the refrigerant.

What happens if you overcharge your AC?

Overcharging or using too much refrigerant in the air conditioner will cause damage to the compressor. Excess refrigerant will build up in the compressor, causing the temperature to drop below average. It may even flood the compressor, causing mechanical parts to fail.

Rapid discharge temperature, natural overheating, high compression ratio, high condenser pressure and overcooling are some of the most typical signs of excess refrigerant.

How often should you vacuum your air conditioning system?

Experts usually recommend servicing the air conditioning machine once a year. To avoid damage, use a vacuum cleaner to remove moisture or air from the piping.

Each year, spring is the right time to service your air conditioner. Although most maintenance tasks can be performed by yourself, if you encounter any major problems, contact an authorized specialist.


We have tried to explain how to vacuum the air conditioning system of a car without a pump, but evacuating the air conditioning system is the most common and useful process. It is necessary to evacuate the A/C system to remove excess air or moisture and protect the machine from possible damage. Why not maintain productivity in a professional manner? Thank you; we’ll discuss it later!