Checking Air Conditioning System

CAUTION: Refrigerant under pressure. Improper servicing may cause refrigerant to penetrate eyes and skin or cause burns.

IMPORTANT: R134a refrigerant must be used. This requires special equipment and procedures. See your John Deere Dealer.

NOTE: Some oil seepage from compressor shaft seal on the lower front is normal.

Check the following if air conditioner will not cool, or cooling is intermittent.

If air conditioner clutch slips after tractor has been in storage, compressor may be stuck. Stop engine and turn key switch to OFF position. Remove clutch cover. Rotate clutch hub back and forth to free compressor.

Operate engine at 2000 rpm. Set air conditioner switch (A) to ON position (DEFOG) and set blower switch (B) clockwise to HIGH position. Check sight glass (C) for bubbles. If bubbles do not disappear, system may be low on refrigerant. Late model tractors do not have a sight glass.

NOTE: Bubbles may appear in sight glass when operating at temperatures below 18°C (65°F). This is normal. Bubbles will disappear as temperature rises. Late model tractors do not have a sight glass.

If cooling is intermittent, clean grille, side screens, radiator and condenser. If problem is not solved, see your John Deere Dealer.

Inspect cab body filters for restriction. Clean filters (See CLEANING OR REPLACING CAB AIR FILTERS, in this Section). If problem persists, see your John Deere Dealer to have evaporator core cleaned.

A-Air Conditioner Switch
B-Blower Switch
C-Sight Glass

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