Question

Explain in your own words the processes to inspect test and replace a compressor clutch.

Explain in your own words the process of removing inspecting and installing a TXV

Thank you in advance!

Answer 1

Inspecting, Testing, and Replacing the Compressor Clutch

Testing of the clutch assembly should occur when the air-conditioning pressure is high enough to turn on the clutch, but the clutch is not coming on or is not staying on. Typically, this component is checked using a DVOM. The technician needs to determine whether the clutch coil is receiving full power and ground. If it is, but still will not turn on, then the clutch coil should be checked for high resistance. If the resistance is too high according to the service information, it needs to be replaced. This number is usually 3–5 ohms. If full power and ground are not present, then wiring and switches need to be inspected and tested according to the wiring diagram.

The air gap is the space between the clutch assembly and the air-conditioning pulley. This gap needs to be checked to be sure it is correct according to specifications in the service information.

To inspect, test, and replace the compressor clutch, follow the steps

1)Inspect the air gap of the clutch. With the clutch disengaged, use feeler gauges to measure the air gap between the drive pulley and the clutch drive plate. If the air gap is too small, follow the manufacturer’s procedure to adjust the air gap.

2)If the air gap is too large, check to see whether the pulley bearing is worn, causing the pulley to wobble and make contact with the clutch.

3)To check the condition of the electrical circuit, perform an amperage test to the compressor clutch. Measure the vehicle’s voltage and clutch resistance (12-volt clutch resistance typically should be 3–5 ohms). Measure the amperage and compare the readings to the calculation. If the readings are in specification, adjust the clutch air gap. If the amperage is out of specification, diagnose the electrical system and replace the clutch.

4)Remove the clutch plate center bolt or nut. If the compressor uses shims, be careful to remove these for later use.

5)Using the appropriate puller, remove the clutch plate.

6)Remove the pulley snap ring, and slide the pulley and bearing off the compressor.

7)Remove the snap ring from the compressor clutch coil, and pull from compressor.

8)Reinstall the components in reverse order. When reinstalling the clutch plate, be sure to adjust the air gap (typical air gap will be 0.012" to 0.025" [0.03 to 0.06 mm]). Check specifications in your service information for the correct air gap.

9)Torque the center bolt or nut to specifications.

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