COMPRESSOR SYSTEM SYMPTOMS

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.	Diagnostic result 1: Replace compressor only. Diagnostic 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.