I have to wonder why you changed it over in the first place. Did you have leakage? Compressor failure? Leaking hose(s)? Having said all of that, here is a quick primer on A/C systems..... First, the system works on compressing the refrigerant into a hot gas. This gas is then condensed into a liquid. The liquid is then fed through a metering device into an evaporator where it then returns to a gaseous state. When this happens, it absorbs a tremendous amount of heat. This is what gives you the cooling effect. Now, two things are DEADLY to an A/C system: air and moisture. Air is a non-compressible gas in this context in that it CANNOT be compressed into a liquid. Since it is evaporation of a liquid that does the real work, air simply reduces efficiency to the point that you may not get any cooling at all. Moisture becomes a problem as it will collect and freeze at the point of evaporation and ultimately clog up the system. Moisture also reacts corrosively with R-134a oils to drastically shorten compressor life.
So, to solve your problem, do the following: 1) Use a recovery machine to remove all old refrigerant and oil from the system. 2) Evacuate the system to remove as much air and moisture as possible. 3) Add a proper oil charge for the system. Typically, there are specifications for how much each component will take. 4) Charge up the system using GAUGES, not can count or "seat of the pants" guesswork. Use a charging chart to determine the correct pressures to achieve for your ambient conditions.
A word about oils: R-12 systems used a mineral oil. This oil circulated through the system and kept the compressor lubricated. R-134a systems cannot use mineral oil because it will not circulate in the system using R-134a. As such, use of ester oils or PAG oils is required. These oils WILL circulate through the system and keep the compressor lubricated. PAG oils and mineral oils are incompatible. Ester oils are somewhat compatible with the left over mineral oil that may be still in the system.
FYI: Most work on tractors and implements are effectively repaired with "farmer fixes." However, systems using electronics and refrigeration systems are NOT compatible with "farmer fixes." These systems need to be serviced by knowledgeable and qualified repair personnel. Don't mean to hurt anyone's feelings. That is just the way it is. Sorry.
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