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R134a
Refrigerant compaticilty is about suiting the refrigerant to your refrigerant system. Every cooling system has refrigerant in it which depends on the type of system you use. If the refrigerant not matches with your system, it wont work. This is refrigerant compatibility.
Excessive superheat, caused by a low refrigerant charge.
Usually, on most cars, this means that the weather is cool or that there is insufficient refrigerant in the system. It can also be caused by a restriction in the AC system or high temperature or excessive amount of refrigerant in the system.
Uncontrolled water supply
To endure that the ONLY gas in the system is refrigerant.
Liquid refrigerant charging of a system is normally accomplished in the liquid line. For example, when a system is out of refrigerant, liquid refrigerant can be charged into the king valve on the liquid line or receiver.
Have an AC shop evacuate the system. Some shops will recharge the system after repairs and not charge for refrigerant, they just give you yours back.
Liquid
Vaporizing the refrigerant
The refrigerant in the refrigrration system absorbs large quantities of heat and releases it to the atmosphere
By "skipping", do you mean "cycling off and on"? That is caused by low refrigerant pressure. Refrigerant slowly leaks even in an air conditioning system that is functioning properly. It's perfectly reasonable to expect to add a little refrigerant every year or two.