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Lack of Or Insufficient Cooling
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Compressor belt broken or off.
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Replace belt.
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Compressor not functioning (if both the large and small hoses in the left hand access panel are at the same temperature).
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See your John Deere dealer.
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High pressure switch on - insufficient air flow across condenser.
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Clean condenser. Check fan belt condition. Check engine fan speed belt position. Check rotary screen function.
See your John Deere dealer.
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Low-pressure switch on - insufficient air flow across evaporator
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Clean filters. Check cab fan operation.
See your John Deere dealer.
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Low-pressure switch on - low outside air temperature.
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Turn dial to warmer setting.
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Low-pressure switch on - insufficient refrigerant level (bubbles in sight glass).
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See your John Deere dealer.
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Heater valve partially on - (with temperature dial turned to maximum [air conditioning], feel both heater hoses on right-hand side of cab. If both are warm, valve is open).
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Adjust control rod through tray opening. Turn dial to OFF. Loosen set screw in ball joint and when applying slight pressure down on rod, tighten ball joint.
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Compressor clutch cycles excessively or compressor stays off up to 15 minutes.
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Evaporator icing.
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Adjust controls correctly. See OPERATORS STATION. Open louvers. Clean filters. Move lever to warmer setting.
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Bad smell (foul odor) in cab.
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Plugged drain tube. Dirty filters. Dirty cab.
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Blow condensate tube. Clean filters. Vacuum out cab.
Be certain weep valve in condensate drain tube is installed.
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Diagnostic light blinking
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Fault with A/C system.
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See your John Deere dealer.
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