S&T Series Blazer, Bravada, Envoy, Jimmy, Rainier, Trailblazer, Xtreme

Compressor

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Removal & Installation



  1. Turn OFF the ignition
  2.  
  3. Drain the coolant to below the level of the engine coolant temperature (ECT) sensor.
  4.  
  5. Disconnect the ECT sensor harness connector.
  6.  
  7. Remove the ECT sensor.

    Click image to see an enlarged view

    Fig. Showing position of the Engine Coolant Temperature (ECT) Sensor (1)

  8.  

To install:

  1. Coat the sensor threads with sealer GM P/N 1050805, or equivalent.
  2.  
  3. Install the ECT sensor (1). Tighten the ECT sensor to 20 Nm (15 ft. lbs.).
  4.  
  5. Connect the ECT sensor harness connector.
  6.  
  7. Refill the coolant system.
  8.  

2.2L & 2.4L Engines
  1. Turn OFF the ignition.
  2.  
  3. Drain the coolant system to below the ECT sensor.
  4.  
  5. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
  6.  
  7. Carefully remove the ECT sensor.
  8.  
  9. Installation is the reverse of the removal procedure. Coat sensor threads with thread lock sealant and tighten sensor to 89 inch lbs. (10 Nm).
  10.  

4.2L Engine

CAUTION
Before beginning this procedure, refer to the precautions at the beginning of this section. Only a MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.

  1. Disconnect the negative battery cable.
  2.  
  3. Recover the refrigerant., as outlined in this section
  4.  
  5. Remove the alternator, as outlined in the Engine Electrical Section.
  6.  
  7. Remove the idler pulley.
  8.  
  9. Disconnect the compressor electrical connectors.
    NOTE
    Some system pressure may still exist in the A/C compressor crankcase after you evacuate the system.

  10.  
  11. Remove the compressor hose assembly bolt from the compressor.
  12.  
  13. Remove the compressor hose assembly block from the compressor.
  14.  
  15. Remove the compressor mounting bolts from the compressor.
  16.  
  17. Remove the compressor .
  18.  
  19. Drain and measure the compressor oil, as follows:
    NOTE
    Drain and measure as much of the refrigerant oil as possible from the removed compressor.

    1. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.
    2.  
    3. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
    4.  
    5. Properly discard the used refrigerant oil.
      NOTE
      The refrigerant oil in the A/C system must be balanced during compressor replacement.

    6.  
    7. The replacement compressor is shipped with 240 ml (8.0 oz) of refrigerant oil.
    8.  
    9. Before installing the compressor, the refrigerant oil will have to be partially drained:
    10.  
    11. Refer to the amount of refrigerant oil recorded during the compressor removal.
    12.  
    13. Subtract the amount recorded from the total system capacity.
    14.  
    15. The difference between the total system capacity and the recorded amount is the calculated amount to be drained from the replacement compressor.
    16.  
    17. Drain the calculated amount of refrigerant oil from the replacement compressor.
    18.  

  20.  

To install:

  1. Install the compressor mounting bolts to the compressor and tighten to 37 ft. lbs. (50 Nm).
  2.  
  3. Install the compressor hose assembly block to the compressor.
  4.  
  5. Install the compressor hose assembly bolt to the compressor. Tighten the bolt to 24 ft. lbs. (33 Nm).
  6.  
  7. Connect the compressor electrical connectors.
  8.  
  9. Install the idler pulley.
  10.  
  11. Install the alternator.
  12.  
  13. Evacuate and recharge the A/C system.
  14.  
  15. Leak test the fittings of the components.
  16.  

4.3L Engine

CAUTION
Before beginning this procedure, refer to the precautions at the beginning of this section. Only a MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.

  1. Disconnect the negative battery cable.
  2.  
  3. Recover the refrigerant from the system.
  4.  
  5. Remove the air cleaner outlet duct.
  6.  
  7. Remove the drive belt.
  8.  
  9. Disconnect the A/C compressor clutch coil electrical connector.
  10.  
  11. Disconnect the A/C high pressure switch electrical connector.
  12.  
  13. Remove the compressor suction/discharge hose assembly from the compressor.
  14.  
  15. Remove the compressor sealing washers and discard.
  16.  
  17. Disconnect the accelerator control cable from the throttle bracket.
  18.  
  19. If equipped, disconnect the cruise control cable from the throttle bracket.
  20.  
  21. Remove the nut and throttle control cable bracket from the throttle body.
  22.  
  23. Remove the 4 compressor mounting bolts.
  24.  
  25. Remove the compressor from the accessory mounting bracket.
  26.  
  27. Drain and measure the compressor oil:
  28.  
  29. Inspect the oil for contamination or metal particles.
  30.  

To install:

  1. Add oil to the new compressor by following the instruction sheets shipped with the compressor. If the instruction sheets are not available, do the following:
    1. Drain the refrigerant oil from the removed compressor into a clean, calibrated container.
    2.  
    3. Record the amount of oil removed from the old compressor.
    4.  
    5. If the amount of oil drained from the old compressor is less than or equal to 60 ml (2 fl oz), add 60 ml (2 fl oz) of new 525 viscosity refrigerant oil to the new compressor.
    6.  
    7. If the amount of oil drained from the old compressor is greater than 60 ml (2 fl oz), add the same amount of new 525 viscosity refrigerant oil to the new compressor.
    8.  

  2.  
  3. Install the new compressor to the accessory mounting bracket.
  4.  
  5. Install the 4 compressor mounting bolts and tighten to 37 ft. lbs. (50 Nm).
  6.  
  7. Install the throttle control cable bracket and nut to the throttle body. Tighten the nut to 106 inch lbs. (12 Nm).
  8.  
  9. If equipped, connect the cruise control cable to the throttle cable bracket.
  10.  
  11. Connect the accelerator control cable to the throttle cable bracket.
  12.  
  13. Install new compressor and suction/discharge sealing washers.
  14.  
  15. Install the compressor suction/discharge hose assembly to the compressor.
  16.  
  17. Connect the A/C high pressure switch electrical connector.
  18.  
  19. Connect the A/C compressor clutch coil electrical connector.
  20.  
  21. Install the drive belt.
  22.  
  23. Install the air cleaner outlet duct.
  24.  
  25. Evacuate and recharge the refrigerant system.
  26.  
  27. Leak test the fitting(s) of the repaired or reinstalled components using the Halogen Leak Detector J 39400-A.
  28.  
  29. Connect the negative battery cable.
  30.  

5.3L Engine

CAUTION
Before beginning this procedure, refer to the precautions at the beginning of this section. Only a MVAC-trained, EPA-certified, automotive technician should service the A/C system or its components.

  1. Recover the refrigerant, as outlined in this section.
  2.  
  3. Remove the washer solvent container.
  4.  
  5. Remove the air cleaner resonator outlet duct.
  6.  
  7. Remove the cooling fan and shroud.
  8.  
  9. Release the tension on the air conditioning drive belt.
  10.  
  11. Reposition the air conditioning drive belt from the compressor pulley.
  12.  
  13. Remove the compressor hose assembly nut from the compressor.
  14.  
  15. Remove the compressor hose assembly from the compressor.
  16.  
  17. Remove the upper A/C compressor mounting bracket bolts.
  18.  
  19. Remove the lower coolant hose.
  20.  
  21. Raise the vehicle.
  22.  
  23. Disconnect the electrical connection from the compressor.
  24.  
  25. Turn the right tire to gain access to the remaining compressor mounting bolts.
  26.  
  27. Remove the lower A/C compressor mounting bracket bolts.
  28.  
  29. Lower the vehicle.
  30.  
  31. Reposition the compressor and mounting bracket to access the remaining compressor to bracket bolts.
  32.  
  33. Remove the upper A/C compressor mounting bolts.
  34.  
  35. Remove the A/C compressor.
  36.  
  37. Remove the A/C compressor bracket.
  38.  
  39. If replacing the A/C compressor, the replacement compressor must be balanced, as follows:
    NOTE
    Drain and measure as much of the refrigerant oil as possible from the removed compressor.

    1. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.
    2.  
    3. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
    4.  
    5. Properly discard the used refrigerant oil.
      NOTE
      The refrigerant oil in the A/C system must be balanced during compressor replacement.

    6.  
    7. The replacement compressor is shipped with 240 ml (8.0 oz) of refrigerant oil.
    8.  
    9. Before installing the compressor, the refrigerant oil will have to be partially drained:
    10.  
    11. Refer to the amount of refrigerant oil recorded during the compressor removal.
    12.  
    13. Subtract the amount recorded from the total system capacity.
    14.  
    15. The difference between the total system capacity and the recorded amount is the calculated amount to be drained from the replacement compressor.
    16.  
    17. Drain the calculated amount of refrigerant oil from the replacement compressor.
    18.  

  40.  

To install:

  1. Add the proper amount of PAG oil to the compressor crankcase.
  2.  
  3. Position the A/C compressor mounting bracket partially into the vehicle.
  4.  
  5. Position the A/C compressor partially into the vehicle.
  6.  
  7. Install the upper compressor mounting bolts into the compressor mounting bracket. Tighten the upper rear bolts to 37 ft. lbs. (50 Nm).
  8.  
  9. Install the upper compressor mounting bolts into the compressor and bracket assembly.
  10.  
  11. Position the compressor and bracket assembly into the correct location on the engine.
  12.  
  13. Tighten the upper compressor mounting bolts to 37 ft. lbs. (50 Nm).
  14.  
  15. Raise the vehicle
  16.  
  17. Start the lower compressor mounting bolts. Tighten the bolts to 37 ft. lbs. (50 Nm).
  18.  
  19. Connect the electrical connector to the A/C compressor.
  20.  
  21. Raise the vehicle.
  22.  
  23. Install the lower coolant hose.
  24.  
  25. Install the compressor hose assembly to the compressor.
  26.  
  27. Install the compressor hose assembly nut to the compressor. Tighten the nut to 12 ft. lbs. (16 Nm).
  28.  
  29. Install the accessory drive belt to the tensioner.
  30.  
  31. Install the cooling fan and shroud.
  32.  
  33. Install the air cleaner resonator outlet duct.
  34.  
  35. Install the washer solvent container.
  36.  
  37. Fill the cooling system.
  38.  
  39. Evacuate and recharge the A/C system.
  40.  
  41. Leak test the fittings of the component, as outlined in this section.
  42.  

 
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