Gleaner R50 A/C blowing hot

Cant seem to get my ac to work. Only blowing warm or can temp air. Any tips?

Is the compressor clutch engaging

I believe so

Is the water for the heat shutting off?

Past that A/C pressure gauges are your friend.

Whats the history of the AC system did it work before is there freon in the system R50 has the air cooled Deutz engine.

I bought the combine last year and it worked perfectly then. It has a deutz Diesel engine
It seems to run cool but not super cold.

Yes the heater is off and I believe the valve is working properly

Are the fins on the radiator clean and clear.

I keep the engine bay pretty clean. Not to much dust. Nothing major. Its a air cooled diesel engine

Sure sounds like it has no freon or low. A set of AC gauges would be good to have. I would double check that the clutch on the compressor kicks in. Could have a bad pressure switch?

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.

There's usually a low pressure switch on suction line.
If you are low on freon, the switch turns off the compressor.
You could short out the switch and see if compressor turns on.
If so, you have a leak someplace. Systems don't lose freon, it leaks it.

I had a 1991 grand caravan which I finally sold. Got tired of chasing leak after leak after leak. It was R12.

Never used 134A in place of r12. I think there is something to do with old r12 compressor oil not mixing well with 134A. Not sure. talk to professional.

Age rots hoses, compressor seal, evaporator and condenser coils leak, steel lines rust.

Hard to find leaks. GOOD LUCK> Keep us posted on what you find.

I'd start with simple stuff like blowing out the coils at the radiator and the one in the cab might even have to take a panel or 2 off in the cab or roof off to get to them. Blow out clean then check for the center of the compressor pulley to start and stop turning as it runs. If it does not do the start and stop routine then you could have a leak or a bad connection in the wiring to the compressor or any of the switches. A/C work sucks with all the junk it is put inside of to get to. I would also put a ball valve in the heater lines to isolate the coolant from circulating during warm weather.

You need to know the pressures to further diagnose

A simple way to tell if it's r12 or 134a. The fittings on 134a are different so your old charging hoses won't work without an adapter.