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in strokes. During the intake stroke, refrigerant vapor is sucked in via the inlet valve (6). If the piston (4) moves in DIAGNOSIS AND TESTING - COMPRESSOR NOISE When investigating an air conditioning related noise, you must first know the conditions under which the noise Drive belts are speed sensitive. At different engine speeds and depending upon belt tension, belts can develop 1. Select a quiet area for testing. Duplicate the complaint conditions as much as possible. Switch the compressor on and off several times to clearly identify the compressor noise. Listen to the compressor while the clutch is 2. Loosen all of the compressor mounting hardware and retighten. Tighten the compressor clutch mounting nut. Be certain that the clutch coil is 3. To duplicate a high-ambient temperature condition (high head pressure), restrict the air flow through the con- denser. Install a manifold gauge set to be certain that the discharge pressure does not exceed 2760 kPa (400 4. Check the refrigerant system plumbing for incorrect routing, rubbing or interference, which can cause unusual noises. Also check the refrigerant lines for kinks or sharp bends that will restrict refrigerant flow, which can cause 5. If the noise is from opening and closing of the high pressure relief valve, reclaim, evacuate, and recharge the refrigerant system. If the high pressure relief valve still does not seat properly, replace the a/c compressor. (Refer 6. If the noise is from liquid slugging on the suction line, check the refrigerant oil level and the refrigerant system charge. 7. If the noise continues, replace the compressor and repeat. (Refer to 24 - HEATING & AIR CONDITIONING/ PLUMBING/A/C COMPRESSOR - REMOVAL). ZH PLUMBING 24 - 135 |