What is AC oil charge?
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Simply so, do I need to add oil when recharging AC?
You normally do this when recharging the system after replacing one of the major components. This is tricky. The service manual normally tells you how much refrigerant oil should be added with each major component replaced on the AC system. Off-the-shelf cans sometimes come with refrigerant oil in them as well.
Beside above, does 134a have oil in it? Yes there is oil in the system to keep the compressor lubricated. It is carried throughout the system in the refrigerant. It is usually added in when the system is charged.
Secondly, what is AC oil?
Like any mechanical system, it's important to make sure your air conditioning system stays lubricated, and AC compressor oil is the lubricant for the job. Your AC compressor creates a low pressure to draw refrigerant into a chamber.
What happens if air gets in AC system?
When air enters a refrigeration system, it collects in the top of the condenser and is trapped. Air will cause a reduction in condenser surface area, which will cause a high condensing pressure. Air can enter the refrigeration system through a leak in the low side of the refrigeration system.