Engine Position Sensor (8.3, 9 Liter) or Crankshaft Sensor (15 Liter) is failed
Mid range clutch solenoid coil or its wiring shorted to power
Temperature select pot open/shorted to power
Engine Position Sensor signal is failed (no signal at engine controller pin A9)
Mid range clutch solenoid coil or its wiring shorted to power
If Failure to cool in electrical system, Compressor clutch not engaging.Expansion valve not functioning. Restriction in refrigerant system. See your John Deere dealer.Faulty wiring or loose connections.Defective temperature control switch.Outside temperature too low, below 21gets warmer.Condenser is overheating. Clean condenser screens, cores and fins of condenser and radiator.