A replacement compressor is a cost-effective solution only when a “compressor failure” was correctly diagnosed and the replacement compressor is properly installed.
Tips for Successful Installation
- Identify the correct compressor
- If the refrigerant is low, the system should be checked for leaks and repaired before the system is recharged. Low refrigerant could damage the replacement compressor.
- Carefully mark all of the hoses and accessories connected to the old compressor before removal. Make a sketch or take a picture if necessary.
- Install a new receiver/drier or accumulator. Replace hoses as necessary. Old hoses deteriorate internally, resulting in tiny particles of rubber blocking orifices in the system.
- It is essential that the system is flushed with an approved flushing chemical before installing the replacement compressor. Contamination in the system is the single highest cause of compressor failure.
- Evacuate the system. Carefully add lubricant and charge the system by following the instructions enclosed with the replacement product or supplementary repair manual.Only the proper type and amount of lubricant and refrigerant should used.
Troubleshooting
If the A/C system is not cooling properly, check for:
- Compressor clutch engagement. If not engaging, confirm that the clutch is receiving the correct voltage. Many systems will not allow the clutch to engage if system pressure is low.
- Proper system pressure using A/C service gauges. If necessary check for leaks with an electronic leak detector or by adding a special dye to the system.
- Noise caused by rattling support brackets, hoses or other parts. A noisy compressor could be caused by cross-contaminated refrigerant, wrong type of lubricant, or air in the system.
- Poor cooling performance could be caused by:
- Low refrigerant
- Overcharged refrigerant
- Moisture in the system
- Air in the system
- Orifice tube plugged
- Expansion valve stuck
Diagnosis should be performed by checking system pressures with A/C service gauges.