OMN406828

Symptom

Problem

Solution

Drafts.

Poor air distribution.

Adjust directional air louvers.

Adjust heater control to a warmer position.

Set pressurizer blower switch to a lower position.

Inadequate air flow.	Clogged air filters.	Clean filters.
	Clogged air inlet screen.	Clean screen.
	Heater core air flow restricted.	Clean evaporator and housing with compressed air.
	Faulty blower fan motor.	See your John Deere dealer.
	Defective blower fan switch.	See your John Deere dealer.
	Loose wire connection.	Tighten wire.

Coolant leaking or dripping from heater core compartment.	Loose hose clamp.	Tighten clamp.
	Ruptured heater hose.	Replace hose.
	Broken heater core tubes.	Repair.
	Drip pan dirty (AC).	Clean evaporator pan and outlet.
	Drain tube plugged (AC).	Clean drain tube.

Pressurizer fan, windshield wiper and/or compressor will not run.	Defective motor.	See your John Deere dealer.
	Defective switch.	See your John Deere dealer.
	Faulty wiring or loose connections.	Repair or replace wiring.

Strange odors inside operator's cab.	Dirty air filter.	Clean filter.
	Evaporator condenser pan dirty.	Clean pan and outlet.
	Drain tube is plugged.	Clean drain tube.
	Tobacco smoke and tar on evaporator exterior.	Clean filter.

Partial frosting and sweating of lines combined with poor cooling.	Compressor belt slipping.	Check automatic belt tensioner. Replace belt and/or pulleys (if worn).
	Loss of refrigerant.	(See your John Deere dealer.)
	Restricted or clogged liquid line.	See your John Deere dealer.
	Expansion valve malfunctioning.	See your John Deere dealer.
	Heater lines crossed.	See your John Deere dealer.

Ice flecks blowing from evaporator.	Control dial set too low.	Adjust the temperature control to a warmer position.
	Insufficient blower speed.	Increase blower speed.

Failure to cool.	Dirty air screen.	Clean screen.
	Dirty air filters.	Clean filters.
	Debris on radiator core or rotary screen.	Clean core or screen.
	Lint or dirt on condenser fins.	Blow out condenser fins with compressed air.
	Insufficient refrigerant or extremely low.	See your John Deere dealer.
	Loose compressor drive belt.	Check automatic belt tensioner.
	Heater on.	Turn heater off.
	Heater lines crossed.	See your John Deere dealer.
	Compressor clutch not engaging.	Check wiring or see your John Deere dealer.
	Expansion valve not functioning.	See your John Deere dealer.
	Restriction in refrigerant system.	See your John Deere dealer.
	Loose wiring connector.	Tighten wire.
	Defective temperature control switch.	See your John Deere dealer.
	Outside temperature too low (below 21°C) (70°F).	Wait until day gets warmer. If there is a malfunction in system, see your John Deere dealer.
	Condenser is overheating.	Clean condenser screens, cores and fins of condenser, oil cooler, and radiator.
	Severe restriction in high side.	See your John Deere dealer.
	Burned out clutch field or faulty field.	See your John Deere dealer.
	Short circuit in control circuit or failure of a switch in circuit.	See your John Deere dealer.

Hissing noise at expansion valve.	Loss of refrigerant.	(See your John Deere dealer.)
	Restriction in refrigerant system.	Check for kinks in hoses.

Heater will not shut off.

Heater hoses connected improperly. Defective heater control valve.

See your John Deere dealer.

Heater will not heat.	Air trapped in heater core.	Bleed the heater.
	Defective thermostats in engine.	Replace the thermostats.
	Air conditioner turned on.	Shut off air conditioner.
	Defective heater control valve.	See your John Deere dealer.
	Shut-off valves closed at engine.	Open valves.

Radio or CD does not function.

Blown fuse.

Replace fuse.

DP99999,00006C4-19-20110418