Looking up the years the R50 was mfg. 86-92 says it originally had a R12 refrigerant AC system, 93 is when they first started using 134A refrigerant in automobiles and sometime shortly after that on off road machinery. If it still has R12 in the system things are going to be a little more complex to get the AC cooling for you. So to help you out we need a definite answer on whether the compressor is turning. Usually this is verified by the front part of the pulley spinning. If you are unfamiliar with AC systems you may have to look at it both with the AC off and on to verify something spins with it on and stops when the AC clutch is off. Two lines come off the compressor, the high pressure line will head over to the condenser which normally is in front of the radiator, not sure how they do this on a Deutz engine, it must have a fan for the hydro oil cooler. Anyway, the other line is the low pressure line, it will head into the cab to connect to the evaporator, That is the coil the air move through to be cooled. When the AC is on and it has near enough Freon to cool the low pressure line should be cool to cold at the compressor. Be careful the high pressure line will be hot. Next we need to know if it has been converted to a 134A system. Look for the AC charging ports, they are likely on the lines where they meet the compressor or somewhere along the hoses in the engine bay. If they have some sort of plastic cap on them that the major diameter is 5/8 inch or larger and are red and blue or red and black it has likely been converted. Check your findings on these items and report back.
Edit: If possible some pictures of the compressor and charging ports would be helpful.
This post was edited by used red MN on 10/20/2021 at 10:12 pm.
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