Follow the next table and perform trouble diagnosis if there is a compressor unit malfunction (internal noise, insufficient cooling).

Symptom
Inspection method
Check list
Result
Action
Noise from compressor unit When A/C is ON.
(rattling or rolling sound)
Cooker system internal pressure
Check with manifold gauge
Both high‐ and low‐pressure sides are high.*2
Recharge with proper amount of refrigerant.
High/low‐pressures hunt.*2
Replace compressor only.
Check compressor oil condition.
Sample compressor oil and judge.
Refer to the criteria shown in compressor lubricant.
Judgment result 1: Replace compressor only.

Judgment result 2: Replace compressor and liquid tank.
Insufficient cooling*1
Compressor body
Check rotation of compressor. If sized or stuck, sample compressor oil and judge.
Cooler system internal pressure
Check with a manifold gauge.
Sample compressor oil and judge if the difference between high‐pressure and low‐pressure is small or if they are almost the same.
Outlet air temperature rises temporarily while driving.*2



Replace compressor only.

*1: First conduct inspection according to trouble diagnosis for each malfunction.
*2: Applicable to variable capacity compressor only.


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