Compressor HVAC: Testing and Inspection
ON-VEHICLE INSPECTION1. INSPECT COMPRESSOR FOR METALLIC SOUND
a. Start engine.
b. Check if there is a metallic sound from the compressor when the A/C switch is ON.
If metallic sound is heard, replace the compressor assembly.
2. INSPECT REFRIGERANT PRESSURE
Initial Inspection and Diagnostic Overview
3. INSPECT COMPRESSOR LOCK SENSOR RESISTANCE
a. Disconnect the connector.
b. Measure resistance between terminals 1 and 2.
Standard resistance:
65-125 Ohms at 20° C (68° F)
If resistance is not as specified, replace the compressor assembly.
4. INSPECT VISUALLY FOR LEAKAGE OF REFRIGERANT FROM SAFETY SEAL
Using a gas leak detector, check for leakage of refrigerant.
If there is any leakage, replace the compressor assembly.