Tag: AC system oil

How to add oil to air conditioning compressor ?

Different types of oil

 

How important is oil in A/C compressors ?

 

 

Oil in the A/C system is essential, primarily to lubricate moving parts, i.e., the compressor. It also enables heat to travel and dissipate from the compressor. As with refrigerant, oil in the A/C system must keep its chemical stability.

 

Insufficient lubrication due to the wrong type of oil and viscosity is the second most frequent reason for A/C compressor damage and failure.

 

Distinct types of a/c oil like PAG,POE or mineral oils with a different viscosity do not mix, leading to poor lubrication, damaged seals and increased automotive air conditioning compressor wear

 

The use of the wrong type of oil could result in the hvac compressor’s piston rubbing against the cylinder surface. If the oil is too thick, it is unable to properly lubricate the tight space between the cylinder wall and the piston. Wrong oil viscosity can result in more internal friction, leading to an increase in compressor temperature and inevitably compressor damage.

 

Blending or mixing of diverse types of oils may result in a new different type and oil viscosity. This oil contamination build-up to the point where it can block the flow of refrigerant and oil, leading to poor lubrication and seizure of the compressor and major system failure.

 

 

Refrigerant moving oil and cooling down the A/C Compressor

 

it is extremely important that the engine not be run on a vehicle with a clutch less compressor if there is no refrigerant in the A/C system. This is because the compressor depends on refrigerant to carry lubricant inside of it.

 

 

How much oil should I add after a/c compressor replacement ?

 

After the refrigerant system has been charged and ran at the factory, the refrigerant oil in the A/C compressor is dispersed throughout the refrigerant system. The A/C receiver/drier, A/C evaporator, A/C condenser and the A/C compressor will each keep a significant amount of the needed refrigerant oil.

The refrigerant oil level in a new A/C compressor must first be adjusted prior to compressor installation.

 

Oil balancing the a/c system:

  1. Measure the oil recovered from the system by recovery/recycling/recharging station.
  2. Drain and measure the oil left in the old compressor using a beaker.
  3. Drain the new compressor and refill it with the same amount of oil removed from the system and old compressor .
  4. For Example :if 2 oz of oil are recovered from the system and 2 oz of oil was drained from the old a/c compressor, drain the new replacement a/c compressor and then add 4oz of the proper oil type and viscosity to the compressor before installation.

 

 

Installing the ac Compressor without balancing the oil in the system, gives a considerable risk of liquid lock, due to too much oil in the A/C system! When adding oil to the ac compressor in your car one out of two methods could be used and the right one will depend on the type of compressor. Oil could be added through the ac compressor oil service port or through the low side or intake of the compressor. Always add oil through the oil service port if it comes with one or compressor damage may result.

 

Most reclaim/recycling recharging stations will measure the lubricant being removed during recovery. This amount of lubricant should be added back into the system after the repairs are done.

 

How could the oil in my car’s A/C system be low?

 

 

Leaking automotive air conditioning systems will leak out refrigerant and the oil that resides inside of the compressor.

Refrigerant oil must be added when an A/C condenser, A/C receiver/drier or A/C evaporator is replaced

Refrigerant oil loss will be evident at the leak point by the presence of a wet, shiny surface around the leak.

 

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How to find an A/C evaporator core leak?

The inside of the windshield has an oily film, and the A/C cooling is inadequate.

An oil film on the windshield could be cause by a refrigerant leak in the evaporator core that may allow some refrigerant oil to escape into the evaporator case. A/C blower motor operation in the defrost mode could carry the oil through the ducts to the windshield. 

A plugged heater case drain would not cause an oily film on the windshield. An oily film could only be caused by a refrigerant leak or by a heater core leak. A plugged case drain could cause water to leak out onto the carpet or possible a musty smell coming from the vents.

Do you need to get the evaporator core in your car inspected ?

We have auto ac specialist near you. Call Today to get your evaporator core inspected.

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Different types of oil

A/C compressor oil.

How to add oil to the AC compressor ?

Modern compressors no longer have a dipstick to allow the A/C compressor oil to be checked

All modern compressors require the oil to be drained from the compressor and measured in a graduated container.

If the system had a leak, the measured amount of oil may be lower than specifications. Always refer to the guidelines given by the manufacturer before adding oil.

Do you need assistance balancing the A/C compressor oil ?

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