I am a case/JD/MF/CAT guy but my experience with JD and IH was that the red light (tractor or combine) was high head pressure warning, generally meaning plugged condenser. At low speed that compressor can't builld the higher pressures to trip the light, but combines run WOT period. On a properly operating system that simply means a condenser issue... plugged, fan, fan belt, fan shroud, dust, debris, dirt, manure, bent fins, internal metallic contamination (no longer proper at that point). Next thing is a NON PROPERLY operating system... air flow, refrigerant flow, compressor, expansion device, deteriorating lines, contamination from oil, wrong oil, too much oil, metal from compressor, rubber from deteriorating hoses, receiver drier issues and restrictions. POssibly that that light comes on at higher speeds, from being OVERCHARGED. I am not there and I can't see it, but in every one of those I have set my hands on, tractor or combine, the red light was high head pressure. No indication for low refrigerant that I ever noticed. Check EVERYTHING. belt, fan, shroud, restriction, fins, EVERYTHING. Follow up with your findings and I bet we can assist further if you reveal something new.
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