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.