Air Conditioning Compressor Replacement

Compressor Replacement (LS4)

Special Tools

J 39400-A Halogen Leak Detector

Removal Procedure

1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
2. Remove the drive belt. Refer to Drive Belt Replacement - Accessory (Service and Repair).
3. Remove the lower radiator air baffle and deflector. Refer to Radiator Air Lower Baffle and Deflector Replacement (Service and Repair).




4. Disconnect the A/C compressor electrical connector.




5. Remove the A/C compressor hose nut from the A/C compressor.





Important: Remove and discard all sealing washers.


6. Remove the A/C compressor hose from the A/C compressor.




7. Remove the stud from the A/C compressor.




8. Loosen the rear mounting bolt from the A/C compressor.




9. Remove the front mounting bolt from the A/C compressor.
10. Remove the front mounting nut from the A/C compressor.
11. Remove the front A/C compressor mounting stud.
12. Install a floor stand under the right front cradle.
13. Loosen the right front cradle bolt and lower the cradle.
14. Remove the A/C compressor.

Important: Replacement compressors are shipped with polyalkylene glycol (PAG) oil.


15. If replacing the compressor, balance the compressor oil. Refer to Compressor Oil Balancing (Service and Repair).

Installation Procedure

Notice: Refer to Fastener Notice (Fastener Notice).

1. Install the compressor drain plug.

Tighten the drain plug to 16 N.m (12 lb ft).





Important: Install the A/C compressor ensuring that the back of the A/C compressor is inserted onto the bolt. Do not tighten the bolt at this time.


2. Install the A/C compressor into the vehicle.





Important: Do not tighten at this time.


3. Install the front A/C compressor mounting bolt.
4. Install the front A/C compressor mounting stud.

Tighten the stud to 10 N.m (89 lb in).

5. Install the front A/C compressor nut.

* Tighten the nut to 50 N.m (36 lb ft).
* Tighten the front bolt to 50 N.m (36 lb ft).
* Tighten the rear bolt to 50 N.m (36 lb ft).




6. Connect the A/C compressor electrical connector.
7. Raise the cradle into position and tighten the bolt.

Tighten the bolt to 145 N.m (107 lb ft).

8. Remove the floor stand from under the vehicle.




9. Install the stud to the back of the A/C compressor.

Tighten the stud to 10 N.m (89 lb in).




10. Install new sealing washers. Refer to Sealing Washer Replacement (Sealing Washer Replacement).
11. Install the A/C compressor hose to the A/C compressor.




12. Install the A/C compressor hose nut.

Tighten the nut to 17 N.m (12.5 lb ft).

13. Install the lower radiator air baffle and deflector. Refer to Radiator Air Lower Baffle and Deflector Replacement (Service and Repair).
14. Install the drive belt. Refer to Drive Belt Replacement - Accessory (Service and Repair).
15. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging (Refrigerant Recovery and Recharging).
16. Leak test the fittings of the component using J 39400-A.