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Lack Of Or Insufficient Cooling.
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Compressor belt off or broken.
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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 belt position. Check rotary screen function. If the cause of the problem cannot be determined, see your John Deere dealer.
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Low-pressure switch on - insufficient air flow across evaporator.
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Clean filter. Check cab fan operation. If the cause of the problem cannot be determined, see your John Deere dealer.
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Low-pressure switch on - low outside air temperature.
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Move slide lever 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 lever in max. 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. Move lever to OFF. Loosen set screw in balljoint and when applying slight pressure down on rod, tighten balljoint.
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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 out condensate tube and clean pan under evaporator. Clean filter. Vacuum out cab.
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Be certain weep valve in condensate drain tube is installed.
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