Refrigerant and A/C compressor oil filling quantities (2024)

FAQs

How much AC compressor oil goes into the compressor? ›

3 ounces In this example the removed compressor contains 3 ounces so the new compressor should have 3 ounces as well.

Additionally, the compressor of the AC system is likely to have specifications regarding the amount of oil to be added. You must check the owner's manual before adding more oil. The AC system in most modern vehicles needs a total of 4 ounces (120 ml) of oil.

Use PAG 100 Oil with R-134a. As some have stated, the total amount is about 8 ounces.

CE R134A Sunizol Refrigeration Compressor Oil, Capacity: 250ml.

If you hear a strange humming noise when switching on your car's A/C system, you may lack compressor oil. Remember, compressor oil's main function is lubrication. When there isn't enough oil to lubricate the parts in your car's A/C compressor, they may grind together, causing a humming noise.

In refrigeration compressors, oil and refrigerant mix continuously. Refrigeration oils are soluble in liquid refrigerant and at normal room temperatures they will mix completely.

The air compressor system holds approximately 1 gallon (4L) of oil. Check the oil level at the sight glass on the front of the WHASP Tank. Continue adding oil until the level is correct.

An evacuation only removes air and moisture. It doesn't remove oil.

Excess oil may accumulate in the evaporator and then return to the compressor in a slug. This could overfill the crankcase and possibly damage the compressor. Excessive amounts of oil in an evaporator decrease the capacity of a system.

Contamination is one of the biggest causes of component failure. Failure to ensure the system is contaminant-free can cause your newly replaced compressor (and other components) to fail and void the component warranty.

What happens if you put too much R134a? ›

This will result in your compressor eventually burning out as the refrigerant mixes with the oil. As this occurs, the compressor will eventually fail, which will cost you more than calling an expert in heating and cooling systems to fix it.

With R-134a, there are primarily three different viscosities of PAG oil being used: PAG 46, which is the most popular viscosity oil; PAG 100, which is also common; and PAG 150, which is not often used, but it is still required for a certain compressor used in some GM vehicles from the '90s to the early 2000s.

All new compressors from Classic Auto Air contain a full system charge of oil. Do not use more than 24 oz. of 134A refrigerant! 1.5 lbs. or 24 oz of R134A is what is required.

There is a significant range in how much oil air compressors require, with no clear standard across manufacturers. VMAC air compressors hold approximately 1-2 gallons (4-9 liters) of compressor oil, depending on the VMAC system, but other systems may contain more or less oil.

Add the right type and amount of oil and secure the rear cap. Hold the compressor so that the open end is facing upward. Insert a funnel that fits into the opening and slowly pour the recommended amount and type of oil. Then, screw the rear cap on tightly and use a wrench to tighten it further so it's secure.

The best way to ensure the long life of your AC compressor is to ensure that you add adequate oil any time you add refrigerant to your system.