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82 AIR CONDITIONING 4 FAULT DIAGNOSIS FAULT CAUSE REMEDY E. 1. Low refrigerant charge; evident by bubbles in sight glass. 1. Leak test. Repair or replace components as required. F. 1. Expansion valve not operating 1. Refer to C-2, C-3, D-1 INSUFFICIENT properly. and E. COOLING 2. Low refrigerant charge-evident 2. Refer to B-1 and E. by bubbles in sight glass. 3. Compressor not pumping. 3. Refer to B-2 and B-3 G. 1. Belt tension. 1. Adjust belt tension. COMPRESSOR 2. Excessive head pressure. 2. Refer to A-1 through BELT A-4 and C-6. SLIPPING 3. Incorrect alignment of pulleys 3. Repair as needed. or worn belt not riding properly. 4. Nicked or broken pulley. 4. Replace as needed. 5. Seized compressor. 5. Replace compressor. 1. Loose or missing mounting bolts. 1. Repair as necessary. 2. Broken mounting bracket. 2. Replace bracket. 3. Loose flywheel or clutch 3. Repair as necessary. retaining bolt. H. 4. Rough idler pulley bearing. 4. Replace bearing. ENGINE 5. Bent, loose, or improperly 5. Repair as necessary. NOISE mounted engine drive pulley. AND/OR 6. Defective compressor bearing. 6. Replace bearing. VIBRATION 7. Insecure mountings of 7. Repair as necessary. accessories; generator, power 8. Excessive head pressure. 8. Refer to A-1, A-2, A-3 A-4 and C-6. 9. Incorrect compressor oil level. 9. Refer to compressor Oil Level Check. HEATER AND AIR CONDITIONING - CIRCUIT 1. For details of heating and air conditioning electrics See Electrical Trouble Shooting Manual. |