GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2001 🢒 Catera 🢒 Engine 🢒 Engine Mechanical - 3.0L (L81) 🢒 Engine Replacement

Removal Procedure

    Object Number: 345337 Size: SH
  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the hood. Refer to Hood Replacement in Body Front End.
  3. Remove the wiper arms. Refer to Windshield Wiper Arm Replacement in Wipers/Washer Systems.
  4. Remove the air inlet grilles. Refer to Air Inlet Grille Panel Replacement in Body Front End.
  5. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation and Air Conditioning.
  6. Drain the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  7. Remove the intake air resonator electrical connector wiring harness from the radiator outlet hose.
  8. Remove the intake air resonator. Refer to Intake Air Resonator Replacement in Engine Controls - 3.0L.
  9. Remove the AIR pipe. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement in Engine Controls - 3.0L.

    10. Important: Tag all of the wires removed to prevent improper reinstallation.

  10. Disconnect the large wiring harness connectors.
  11. Unclip the ECM from the underhood electrical center.
  12. Unclip the relays from the electrical center box to enable removal of the entire wiring harness (ECM included) from the electrical center.
  13. Remove the body ground wire from the negative battery cable end.
  14. Remove the 4 power supply wires from the battery positive cable end.
  15. Drape the entire wiring harness over the top of the engine and secure to prevent interference when removing the engine.
  16. Remove the engine cooling fan. Refer to Engine Cooling Fan Replacement in Engine Cooling.
  17. Siphon the power steering fluid from the power steering reservoir.

    18. Object Number: 142014 Size: SH
  18. Release the power steering suction hose clamp and remove the power steering suction hose from the reservoir.

    19. Object Number: 143146 Size: SH
  19. Remove the power steering hose from the power steering pump.

    20. Object Number: 219643 Size: SH

    Important: Tag all of the vacuum hoses to aid in reassembly.

  20. Remove the brake booster threaded vacuum fitting from the intake plenum (1).
  21. Remove the vacuum hoses (2) from the brake power booster hose.
  22. Relieve the fuel system pressure. Refer to Fuel Pressure Relief in Engine Controls - 3.0L.

    23. Important: Residual fuel may be present in the supply hose, provide a means to capture fuel if necessary.

  23. Remove the fuel supply and return hose from the intake manifold.
  24. Release the throttle body coolant hose clamp and remove the hose from the throttle body.
  25. Remove the vacuum hose from the purge valve located on top of the engine ventilation chamber. (The engine ventilation chamber is located on the rear, passenger side of the engine).

    26. Object Number: 153285 Size: SH
  26. Remove the vacuum hose from the hot water control valve.
  27. Release the coolant reservoir hose clamp and remove the hose from the coolant intake pipe.
  28. Remove the electric heater water pump screws from the right side of the engine compartment.
  29. Drape the electric heater water pump (with hoses still attached) over the top of the engine and secure.

    30. Object Number: 309505 Size: SH

    Important: Use care with the locking tabs on the quick connects, they break easily.

  30. Disconnect the heater hose quick connects from the heater core pipes.
    31. 30.1. Raise the air inlet screen on the passenger side and open the access door near the pollen filter.
    30.2. Squeeze the tabs on the locking collar and pull back on the sleeve to unlock.
    30.3. Carefully pull back on the tabs to remove the quick connect from the heater core pipes.
    30.4. Discard the green assembly markers (1) if attached.
  31. Remove the A/C compressor/condenser (high pressure) hose bracket screws where the bracket connects near the driver's side frame rail.

    32. Object Number: 153189 Size: SH
  32. Remove the condenser line bolt from the condenser.
  33. Remove the condenser high pressure line from the condenser and plug the connections to prevent A/C system contamination.
  34. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  35. Remove the 4 engine splash shield bolts.
  36. Remove the engine splash shield.
  37. Drain the engine oil.
  38. Remove the A/C compressor. Refer to Air Conditioning Compressor Replacement in Heating Ventilation and Air Conditioning.
  39. Remove the transmission. Refer to Transmission Replacement in Automatic Transmission.

    40. Object Number: 159487 Size: SH
  40. Remove the engine mount nuts. Note the orientation of the locator tab (1).
  41. Lower the vehicle.
  42. Remove the evaporator line bolt from the block fitting.
  43. Remove the high pressure A/C line from the evaporator.
  44. Remove the high pressure A/C line from the vehicle.
  45. Install the engine lifting device to the engine.
  46. Remove the engine with assistance.
  47. Transfer parts as necessary.

Installation Procedure

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  1. Install the motor mounts to the engine brackets, if removed.

    2. Tighten
    Tighten the upper motor mount nuts to 40 N·m (30 lb ft).

  2. Install the engine with assistance.
  3. Remove the engine lift from the engine.
  4. Install the high pressure A/C line to the vehicle.
  5. Install the high pressure A/C line to the evaporator.
  6. Install the evaporator line bolt to the block fitting.

    7. Tighten
    Tighten the evaporator line bolt to 27 N·m (20 lb ft).

  7. Raise the vehicle.

    8. Object Number: 159487 Size: SH

    Important: Ensure the guide pins (1) are in place and install the engine mount nuts.

  8. Install the lower engine mount nuts.

    9. Tighten
    Tighten the lower engine mount nuts to 55 N·m (41 lb ft).

  9. Install the transmission. Refer to Transmission Replacement in Automatic Transmission.
  10. Install the A/C compressor. Refer to Air Conditioning Compressor Replacement in Heating Ventilation and Air Conditioning.
  11. Install the engine splash shield.
  12. Install the 4 engine splash shield bolts.

    13. Tighten
    Tighten the engine splash shield bolts to 10 N·m (89 lb in).

  13. Lower the vehicle.

    14. Object Number: 153189 Size: SH
  14. Install the A/C system high pressure condenser line to the condenser:
    15. 14.1. Remove the plugs from the fittings.
    14.2. Clean the fittings and the surrounding areas.
    14.3. Install new O-rings.
    14.4. Lubricate the O-rings with mineral oil, 525 viscosity.
    14.5. Install the condenser line into the condenser.
  15. Install the condenser line bolt.

    16. Tighten
    Tighten the condenser line bolt to 27 N·m (20 lb ft).

  16. Reposition the A/C compressor/condenser high pressure hose and bracket.
  17. Install the A/C compressor/condenser high pressure hose bracket screws where the bracket connects near the driver's side frame rail.

    18. Tighten
    Tighten the A/C compressor/condenser hose bracket screws to 8 N·m (71 lb in).


    Object Number: 309508 Size: SH

    Important: Ensure the quick connects are fully seated and that the retaining sleeves are pushed in to the locked position.

  18. Install the heater hose quick connects to the heater core pipes:
    19. 18.1. Discard the green assembly marker (1), if not attached to the quick connect.
    18.2. Press the quick connects onto the heater core pipes.
    18.3. Inspect that the quick connects are fully seated.
    18.4. Squeeze the locking tabs (2) and push the retaining sleeve (3) into the locked position.
    18.5. Close and secure the access door near the pollen filter.
    18.6. Lower the air inlet screen.
  19. Install the electric heater water pump (with the hoses attached) to the right side of the engine compartment.

    20. Tighten
    Tighten the electric heater water pump screws until fully seated and not stripped.

  20. Install the coolant reservoir hose and clamp to the coolant intake pipe.

    21. Object Number: 153285 Size: SH
  21. Install the vacuum hose to the hot water control valve.
  22. Install the vacuum hose to the purge valve located on the engine ventilation chamber.
  23. Install the coolant hose and clamp to the throttle body.
  24. Install the fuel supply and the fuel return hose to the intake manifold.

    25. Tighten
    Tighten the fuel supply and the fuel return hose to 15 N·m (11 lb ft).


    Object Number: 219643 Size: SH
  25. Install the vacuum hoses (2) to the brake power booster hose.
  26. Install the brake booster threaded vacuum fitting (1) to the intake plenum.

    27. Tighten
    Tighten the brake booster threaded vacuum fitting until fully seated. Do not strip the brake booster threaded fitting.


    Object Number: 143146 Size: SH
  27. Install the power steering pump discharge hose to the power steering pump.

    28. Tighten
    Tighten the power steering pump discharge hose connection to 28 N·m (21 lb ft).


    Object Number: 142014 Size: SH
  28. Install the power steering suction hose and clamp.
  29. Install the cooling fan. Refer to Engine Cooling Fan Replacement in Engine Cooling.
  30. Reposition the engine wiring harness to the engine.

    31. Object Number: 345337 Size: SH
  31. Install the four power supply wires to the battery positive cable end.
  32. Install the body ground wire to the battery negative cable end.
  33. Install the wiring harness to the electrical center box and clip the relays in place.
  34. Install the ECM and secure in place.
  35. Connect the large wiring harness connectors.
  36. Install the AIR pipe. Refer to Secondary Air Injection Check Valve and Check Valve Pipe Replacement in Engine Controls - 3.0L.
  37. Install the air intake resonator. Refer to Intake Air Resonator Replacement in Engine Controls - 3.0L.
  38. Install the intake air resonator electrical connector wiring harness to the radiator outlet hose.
  39. Install the air inlet grilles. Refer to Air Inlet Grille Panel Replacement in Body Front End.
  40. Install the wiper arms. Refer to Windshield Wiper Arm Replacement in Wipers/Washer Systems.
  41. Install the hood. Refer to Hood Replacement in Body Front End.
  42. Fill the power steering system.
  43. Fill the crankcase with engine oil. Refer to Engine Oil and Oil Filter Replacement .
  44. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  45. Recharge the A/C system. Refer to Refrigerant Recovery and Recharging in Heating, Ventilation and Air Conditioning.
  46. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.
  47. Bleed the power steering system.
  48. Inspect for fluid and exhaust leaks.