This requires knowing type of refrigerant and temperatures the system is running at.
The test or work book will have all this info so you can work it out.
Add refrigerant vapor on the low side of the system ,the compressor raises the pressure of the refrigerant on the high side of the system and lowers the pressure on the low side
Add refrigerant vapor on the low side of the system ,the compressor raises the pressure of the refrigerant on the high side of the system and lowers the pressure on the low side
Add refrigerant vapor on the low side of the system ,the compressor raises the pressure of the refrigerant on the high side of the system and lowers the pressure on the low side
it is the low pressure side
Because it's the only way to recover it. You recover from the high pressure side, and charge it on the low pressure side.
You cool it and run it through a metering devise.
The condenser does not have a low pressure side, because the condenser is not on the low pressure side of the system - it is on the high pressure side, and refrigerant going into the system is at high pressure throughout the whole of the condenser. The high pressure side of an AC system begins at the compressor outlet and ends at the metering device inlet (refrigerant leaves the compressor outlet and goes directly into the condenser inlet). The low pressure side runs from the metering device outlet to the compressor inlet.
That would depend on the type of refrigerant that is being used.
The high pressure (discharge) side starts at the compressor outlet and ends at the metering device inlet. This side will have the smaller refrigerant lines. The low pressure (vacuum) side begins at the metering device outlet and ends at the compressor inlet. This side will have the larger refrigerant lines.
The most basic thing is that is circulates refrigerant through the system. It also separates the low pressure side from the high pressure side of the system.
Low
Check the refrigerant level. Your vehicle probably uses 134A refrigerant so it shouldn't be too expensive. If the refrigerant level is low, someone can add refrigerant for you or you can purchase the tools and do it yourself. Refrigerant is added with the engine running, and to the "low" side. Never allow the "High" side to be over pressure.