| Symptom | Problem | Solution |
System Will Not Produce Sufficient Cooling | Fan speed switch off | Press blower setpoint adjust switch on armrest console and turn selection dial up or down according to desired blower speed. |
| | Compressor not functioning (both the large and small air-conditioning hoses, exiting right-hand rear corner of cab, are at the same temperature) | See your John Deere dealer. |
| | High-pressure switch open. Insufficient air flow across condenser | Clean condenser. Check rotary wand duct for obstruction. Clean air screen. See your John Deere dealer. |
| | Low-pressure switch open. Insufficient air flow across evaporator | Clean cab filters. Check cab fan operation. See your John Deere dealer. |
| | Low-pressure switch open. Low outside air temperature | Move temperature control to warmer setting. |
| | Low-pressure switch open. Insufficient refrigerant level | See your John Deere dealer. |
| | Heater core door partially open | See your John Deere dealer. |
| | Insufficient blower speed | Increase blower speed. |
| | Debris on radiator screen | Clean screen. |
| | Compressor clutch not engaging | See your John Deere dealer. |
| | Condenser is overheating | Clean screens, cores and fins of condenser, oil cooler, and radiator. |
| | Burned out clutch field or faulty field | See your John Deere dealer. |
| | Faulty high pressure or low pressure switches | Replace switches. |
| | Faulty A/C evaporator thermostat sensor | Replace A/C evaporator thermostat sensor. |
| | Recirculating fan disconnected | Check connectors at fan switch. |
| | Compressor partially or completely seized | Remove compressor for service or replacement. |
| | Dirty filters | Clean filters. |
| | Broken or disconnected electrical wire | Check all terminals for loose connections; check wiring for hidden breaks. |
| | Broken or disconnected cab ground wire | Check ground wire to see if loose, broken, or disconnected. |
| | Expansion valve stuck in open position | Replace expansion valve. |
| | Expansion valve stuck shut | Replace expansion valve. |
| | Broken refrigerant line | Examine all lines for evidence of breakage by external stress of rubbing wear. |
| | Leak in system | Evacuate system, apply static charge, leak test system, and repair leak as necessary. |
| | Restriction in refrigerant system | Check for kinked hoses. |
| | Restriction in receiver/dryer | See your John Deere dealer. |
| | Restriction in expansion valve | See your John Deere dealer. |
| | Compressor shaft seal leaking | Replace the compressor. |
| | Excessive moisture in system, causing expansion valve freeze up | Drain and recharge. Replace receiver-dryer. |
| | Clogged cab roof inlet panel | Remove and clean. |
| | Evaporator fins clogged | Blow out evaporator fins with compressed air. |
| | Too little refrigerant in system | Recharge system. |
| | Clogged screen in receiver-dryer | Discharge system; replace receiver-dryer. Then evacuate and charge system. |
| | Excessive moisture in system | Discharge system; replace receiver-dryer. Then evacuate and charge system. |
| | Air in system | Discharge, evacuate, and charge system. |
Air Conditioning System Cools Intermittently | Compressor clutch slipping | Slippage over a prolonged period will require that clutch be removed for service; may require adjustment for proper spacing. |
| | Unit icing up may be caused by excessive moisture in system, inoperative expansion valve, or faulty evaporator temperature sensor | Replace expansion valve; replace receiver-dryer if excess moisture is present; replace thermostat. |
| | Evaporator Temperature sensor defective | Replace sensor. |
| | Defective blower switch or blower motor | Remove defective part for service or replacement. |
| | Partially open, improper ground, or loose connection in compressor clutch coil or solenoid | Check connections or remove clutch coil or solenoid for service or replacement. |