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4-Troubleshooting
Compressor troubleshooting
When a problem occurs during the compressor operation, it is often difficult to pinpoint exact the cause
of the malfunction.
As long as the compressor maintenance is done correctly, there should not be any problem throughout
the whole vehicle life, but should it happen, we hope this troubleshooting can help you solve the issue
efficiently.
Below are listed most of the issues you may encounter while the A/C is ON.
Please refer to the compressor troubleshooting tree to localize the malfunction symptom, then look at the
table (p.30-32) for the appropriate counter measure.
Most of the malfunction symptoms can be classified in the following categories:
1. Insufficient cooling capacity
2. Abnormal noise
3. Smoke
In case of insufficient cooling capacity, we recommend that you prepare a gauge manifold to measure the
pressure of both discharge and suction sides (for a detailed diagnosis by gauge pressure, see p.33 - 34).
Compressor troubleshooting tree
1. Insufficient cooling capacity
2. Abnormal noise
3. Smoke
A. Compressor is not running
B. Compressor is running
C. Compressor runs intermittently
A. Abnormal noise from compressor
B. Abnormal noise from magnetic clutch
C. Belt slipping noise
A. Magnetic clutch friction surface slipping
B. Magnetic clutch belt slipping
C. Smoke from magnetic clutch
D. Smoke from compressor
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