Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2001LANDCRUISER V8-4.7L (2UZ-FE)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGCOMPRESSOR HVACTESTING AND INSPECTION
2001 Toyota Landcruiser V8-4.7L (2UZ-FE)
Compressor HVAC: Testing and Inspection
2001 Toyota Landcruiser V8-4.7L (2UZ-FE)SECTION Testing and Inspection
COMPRESSOR AND MAGNETIC CLUTCH
ON-VEHICLE INSPECTION
1. INSPECT COMPRESSOR FOR METALLIC SOUND
Check there is abnormal metallic sound from the compressor when the A/C switch is ON.
If abnormal metallic sound is heard, replace the compressor assembly.
2. INSPECT REFRIGERANT PRESSURE
3. INSPECT VISUALLY FOR LEAKAGE OF REFRIGERANT
Using a gas leak detector, check for leakage of refrigerant. If there is any leakage, replace the compressor assembly.
4. INSPECT COMPRESSOR LOCK SENSOR RESISTANCE
a. Disconnect the connector.
b. Measure resistance between terminals 1 and 2.
Standard resistance: 570 - 1,050 ohm at 20 °C (68 °F)
If resistance is not as specified, replace the compressor.
5. CHECK FOR LEAKAGE OF GREASE FROM CLUTCH BEARING
6. CHECK FOR SIGNS OF OIL ON PRESSURE PLATE OR ROTOR
7. INSPECT MAGNETIC CLUTCH BEARING FOR NOISE
a. Start engine.
b. Check for abnormal noise from the compressor when the A/C switch is OFF.
If abnormal noise is being emitted, replace the rotor of magnetic clutch.
8. INSPECT MAGNETIC CLUTCH OPERATION
a. Disconnect the connector.
b. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to the body ground.
c. Check that the magnetic clutch is energized.
If operation is not as specified, replace the magnetic clutch.
ON-VEHICLE INSPECTION
1. INSPECT COMPRESSOR FOR METALLIC SOUND
Check there is abnormal metallic sound from the compressor when the A/C switch is ON.
If abnormal metallic sound is heard, replace the compressor assembly.
2. INSPECT REFRIGERANT PRESSURE
3. INSPECT VISUALLY FOR LEAKAGE OF REFRIGERANT
Using a gas leak detector, check for leakage of refrigerant. If there is any leakage, replace the compressor assembly.
4. INSPECT COMPRESSOR LOCK SENSOR RESISTANCE
a. Disconnect the connector.
b. Measure resistance between terminals 1 and 2.
Standard resistance: 570 - 1,050 ohm at 20 °C (68 °F)
If resistance is not as specified, replace the compressor.
5. CHECK FOR LEAKAGE OF GREASE FROM CLUTCH BEARING
6. CHECK FOR SIGNS OF OIL ON PRESSURE PLATE OR ROTOR
7. INSPECT MAGNETIC CLUTCH BEARING FOR NOISE
a. Start engine.
b. Check for abnormal noise from the compressor when the A/C switch is OFF.
If abnormal noise is being emitted, replace the rotor of magnetic clutch.
8. INSPECT MAGNETIC CLUTCH OPERATION
a. Disconnect the connector.
b. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to the body ground.
c. Check that the magnetic clutch is energized.
If operation is not as specified, replace the magnetic clutch.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.