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Since the fittings for the two ports will work on the respective ports only because of size limitations and to prevent confusion. When you have completely secured the ports, tighten the small valve which activates internal plunger. The plunger helps to open port valve to refrigerant lines. Now check the readings in the two gauges both low and high side ports with valves in closed position.

How to Vacuum A/C Lines | Home Guides | SF Gate

The pressure should indicate zero reading. Connect AC vacuum pump to gauge manifold of refrigerant by connecting the yellow central hose present in gauge set to vacuum pump and turn the pump on. The vacuum level should be checked until it reaches 27 Hg or inches. The pump should be run for a minimum of minutes. Normally the AC system has a combination of oil and refrigerant to ensure the compressor is kept well lubricated while the system is operating.

  • How to Vacuum an AC System | It Still Runs.
  • How to Use a Vacuum Pump: 9 Steps (with Pictures) - wikiHow.
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Since it is difficult to measure the oil level in the system, as it is spread out, you need to be careful while adding the oil. If it is a big leak and you can see oil dripping from the system. In case of minor leaks, there will be very little oil dripping out. You can add oil in small amounts accordingly. To let the vacuum pump do its work, open the valve on the low port side of the gauge. This will pull the vacuum inside the system. This will be indicated by the moving needle in the gauge. The tone of the pump changes when the valve is opened fully.

How to Properly Recharge Your AC System

It begins to pull out air fully from the AC. After running the pump for about 30 minutes, close the valve on the low pressure side and switch off the pump. The system should hold pressure at around 27 inches. If this level is not reached, it indicates a major leak. If it is a small leak the level is reached but vacuum is lost after closure of valve. You need to recheck the system for any leak. Leaks can occur in the hose connected to valve set or the O ring may be faulty.

If you find the vacuum is held for 15 minutes without any change, you can proceed to adding the refrigerant. Remove the hose from vacuum pump. Place it in the refrigerant can or in Freon.

How to Vacuum Down and Recharge an Air Conditioner

Now start your car. Turn the air conditioner on. Open low pressure in the manifold gradually. This will allow even flow of Freon or other refrigerant into the AC. Watch this YouTube video to get a more clear idea of the process:. Refrigerant gauge is a great money and time saver.

How to Vacuum A/C Lines

If you do not use it and opt to hook the vacuum pump directly to the Air conditioner, there will be loss of vacuum whenever you disconnect the connector hose from the vacuum pump. This will make it difficult for the moisture to evaporate completely. Now that you have gone through our step by step guide on how to vacuum AC system in your car, you can easily perform the task on your own.

You can have your car Air Conditioner running efficiently and enjoy the cool air in comfort.

Let's Begin

The steps can be completed in a short time and do not need much technical know how. And remember to post your comments below. We look forward to your valuable feedback. Notify me of follow-up comments by email. Notify me of new posts by email. The trapped air or moisture can result in loss of oiling capability of the AC compressor.

Presence of moisture results in condensation and freezing of the air conditioning system. The condensed water particles will corrode the system. Vacuums are used to evacuate ACs, a process by which they pull out all air and moisture from the refrigerant system prior to testing, repairs, and recharging.

Generally, this is best done by an HVAC professional. If you are looking to do simple at-home repairs, though, learning to use a vacuum pump could be very helpful. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. Together, they cited information from 11 references. Fill the pump with vacuum oil. Before you use your vacuum pump, make sure it is full of clean vacuum pump oil.

Unscrew the oil fill cap, typically located on the top of the pump, and look on the interior edge of the opening for the fill line. Fill the opening with oil until it reaches that line. Then, replace the oil fill cap. Using other mechanical oils could impact the quality and performance of your vacuum. Attach your gauges to the ports. You will need a gauge set that connects to both your vacuum and your pressure ports on your AC system. The blue gauge and hose should connect to the low-pressure service port.

The red gauge and hose will connect to the high-pressure port. The yellow hose in the middle should connect your gauges to your vacuum.

Step 1: Locating High and Low Side Service Ports

Loose seals can compromise your vacuum. In your car, your high-pressure port will generally be physically higher than the low-pressure port. Open your manifold valves. Once you have your gauges in place, you will need to use the valves on your AC system that opens and closes the service port to the refrigerant lines. With the valves closed, your gauges should have little to no pressure reading.

After you are sure everything has been securely connected, use the switch device on your vacuum pump to turn it on. You should be able to hear the vacuum running once it is switched on. Then, close it off again.