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All cab electrical switches do not work
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Loose, defective or blown fusible link.
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See your John Deere dealer.
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Blower malfunctioning
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Blower does not work.
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Check both blower fuses.
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Blower operates only in "Purge" position
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One of two fuses blown.
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Replace fuse.
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Blown blower resistance assembly.
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See your John Deere dealer.
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Heater does not work
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Low coolant level
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Check coolant level - add if necessary.
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Faulty thermostat.
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See your John Deere dealer.
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Heater control valve not functioning properly.
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See your John Deere dealer.
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Heater core or hoses clogged or damaged.
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Flush cooling system.
Replace heater core or hoses. See your John Deere dealer.
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Air conditioning does not work
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Compressor belt loose or slipping.
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Adjust belt tension. Replace belt if necessary.
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Blown fuse.
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Replace fuse.
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Defective switch.
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See your John Deere dealer.
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Faulty wiring or loose connections.
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See your John Deere dealer.
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Defective compressor clutch.
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See your John Deere dealer.
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Drafts
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Poor air distribution
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Adjust directional air louvers.
Set blower switch to medium or low positions.
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| Symptom |
Problem |
Solution |
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Inadequate air flow
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Clogged air filters.
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Clean filters.
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Evaporator core air flow restricted.
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Clean evaporator and housing with compressed air.
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Faulty blower fan motors.
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See your John Deere dealer.
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Defective blower switch.
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See your John Deere dealer.
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Faulty wiring or loose connections.
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See your John Deere dealer.
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Water leaking or dripping from evaporator core compartment
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Loose hose clamp.
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Tighten clamp.
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A/C drip pan dirty.
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Clean evaporator pan and outlet with compressed air.
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A/C drain tubes plugged.
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Clean drain tubes.
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Strange odors inside operator's cab
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Dirty air filters.
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Clean filters.
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Evaporator condenser pan dirty.
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Clean pan and outlet with compressed air.
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Drain tubes plugged.
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Clean drain tubes.
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Tobacco smoke and tar on evaporator exterior.
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Clean filters.
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Partial frosting and sweating of lines combined with poor cooling
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Compressor belt slipping.
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Adjust compressor belt tension.
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Loss of refrigerant.
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Check sight glass for bubbles and system for leaks. See your John Deere dealer.
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Restricted or clogged liquid line.
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See your John Deere dealer.
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Expansion valve malfunctioning.
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See your John Deere dealer.
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Ice flecks blowing from evaporator
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Control dial set too low.
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Adjust the temperature control to a warmer position.
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| Symptom |
Problem |
Solution |
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Failure to cool
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Insufficient blower speed.
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Increase blower speed.
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Dirty air filters.
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Clean filters.
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Debris on front grille and side screens.
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Clean grille and screens.
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Lint or dirt on condenser fins.
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Blow out condenser fins with compressed air.
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Refrigerant is lost or extremely low.
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See your John Deere dealer.
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Loose compressor drive belt.
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Adjust belt tension.
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Compressor clutch not engaging.
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See your John Deere dealer.
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Expansion valve not functioning.
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See your John Deere dealer.
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Restriction in refrigerant system.
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See your John Deere dealer.
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Faulty wiring or loose connections.
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See your John Deere dealer.
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Defective temperature control switch.
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See your John Deere dealer.
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Failure to cool
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Outside temperature too low. (Below 70°F) (21°C).
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Wait until day gets warmer. If there is a malfunction in system-see your John Deere dealer.
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Condenser is overheating.
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Clean condenser screens, cores and fins of condenser and radiator.
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Severe restriction in high side.
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See your John Deere dealer.
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Burned out clutch field or faulty field.
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See your John Deere dealer.
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Short circuit in control circuit or failure of a switch in circuit.
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See your John Deere dealer.
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Hissing noise at expansion valve
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Loss of refrigerant.
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Check sight glass for bubbles and system for leaks.
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Restriction in refrigerant system.
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Check for kinks in hoses.
Check receiver-dryer for uniformity of temperature. If temperature is not uniform, see your John Deere dealer.
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