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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 134 (Engine Heating And Cooling - Repair Instructions (2 Of 2)) >> Repair Instructions >> Heater Inlet And Outlet Pipe Replacement (LF4) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable. Battery Negative Cable Disconnection and Connection
  2. Drain the cooling system. Refer to Cooling System Draining and Filling (LF4 Static Fill) , or Cooling System Draining and Filling (LF4 GE 47716)
  3. GM5325063

    Windshield Wiper Arm (3) - Remove [2x]

  4. Using the appropriate trim tool, remove the windshield wiper arm finish cap (1) from the windshield wiper arm (3).
  5. Windshield Wiper Arm Nut (2) - Remove
  6. Grasp the outer end of the windshield wiper arm (3) and gently rock the arm back and forth to remove it from the windshield wiper transmission pivot shaft.
  7. GM5417116

    Air Inlet Grille Panel Extension (1) - Remove [2x]

  8. Apply two layers of masking tape around the top edge of the service part to prevent paint damage.
  9. Using a suitable plastic trim tool, carefully release the air inlet grille panel extension clips.
  10. Remove the air inlet grille panel extension (1) from the air inlet grille panel and upper front fender.
  11. GM5862927

    Front Compartment Side Sight Shield Retainer (1) - Remove [3x]

  12. Front Compartment Side Sight Shield (2) - Remove
  13. GM5421986

    Remove the 2 hood rear outer air inlet seal retainer (1) from the left and right side.

  14. Remove the hood rear outer air inlet seal (2) from the left and right side.
  15. GM5865291

    Air Inlet Grille Panel Retainer (1) - Remove [2x]

  16. Air Inlet Grille Panel Extension (2) - Remove
  17. GM5417442

    Air Inlet Grille Panel Retainer (1) - Remove [6x]

  18. Air Inlet Grille Panel (2) - Remove
  19. Disconnect the windshield washer nozzle hose from the windshield washer pump hose.
  20. Lift the front edge of the air inlet grille panel (2) and slide the panel forward from both hood hinges to remove.
  21. GM5420286

    Windshield Wiper System Module Shield (1) - Remove

  22. GM5420344

    Disconnect the windshield wiper motor electrical connector.

  23. Windshield Wiper System Module Bolt (1) - Remove [2x]
  24. Slide the windshield wiper system module (2) inboard to release the grommet from the plenum and remove the windshield wiper system module (2) from the vehicle.
  25. GM5499581

    Air Inlet Deflector Water Deflector Retainer (1) - Remove [2x]

  26. GM5499583

    Air Inlet Deflector Water Deflector (1) - Remove

  27. GM5422039

    Plenum Front Panel Nut (1) - Remove [3x]

  28. Plenum Front Panel Bolt (2) - Remove [3x]
  29. Disconnect the electrical connector.
  30. Pull the forward lamp wiring harness (3) out from the plenum front panel.
  31. GM5865879

    Plenum Front Panel Bolt (1) - Remove [4x]

  32. Plenum Front Panel Nut (2) - Remove [3x]
  33. GM5865881

    Plenum Front Panel (1) - Remove

  34. GM5839283

    Intake Manifold Cover Bolt (1) - Remove

  35. Intake Manifold Cover (2) - Remove
  36. Install the oil filler cap after removal of the intake manifold cover to prevent debris from falling into the engine.
  37. GM5861123

    Radiator Surge Tank Inlet Hose Clamp (1) @ Radiator Surge Tank Inlet Hose - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  38. Radiator Surge Tank Inlet Hose Clip (2) @ Engine Control Module Bracket - Remove
  39. Radiator Surge Tank Inlet Hose Clamp (4) @ Engine Radiator - Disengage - Hose Clamp Replacement Guidelines - Spring Type
  40. Radiator Surge Tank Outlet Pipe (3) - Remove
  41. GM5839234
    CAUTION:

    Always turn the ignition off when installing or removing the ECM connectors in order to prevent damage to the components.

    CAUTION:
    • Turn the ignition OFF when installing or removing the control module connectors and disconnecting or reconnecting the power to the control module in order to prevent internal control module damage.
    • Control module damage may result when the metal case contacts battery voltage. DO NOT contact the control module metal case with battery voltage when servicing a control module, using battery booster cables, or when charging the vehicle battery.
    • In order to prevent any possible electrostatic discharge damage to the control module, do no touch the connector pins or the soldered components on the circuit board.
    • Remove any debris from around the control module connector surfaces before servicing the control module. Inspect the control module connector gaskets, and ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the control module.

    Disconnect the electrical connectors.

  42. Use a suitable tool to release the locking tabs securing the engine control module to the engine control module bracket.
  43. Engine Control Module (1) - Remove
  44. GM5839232

    Engine Control Module Bracket Bolt (1) - Remove [3x]

  45. GM5839233

    Use a suitable tool to release the locking tab and remove the transmission control module (1) by sliding it out from the engine control module bracket (2).

  46. Engine Control Module Bracket (2) - Remove
  47. GM5864524

    Radiator Air Upper Baffle Retainer (1) - Remove [5x]

  48. Radiator Air Upper Baffle Bolt (2) - Remove [2x]
  49. Radiator Air Upper Baffle- Upper (3) - Remove
  50. GM5839407

    Remove all wiring harness retainers from the front end sheet metal cross braces.

  51. Front End Sheet Metal Cross Brace Bolt- Left Side and Right Side (1) - Remove [6x]
  52. Front Suspension Strut Upper Mounting Nut- Left Side and Right Side (2) - Remove [4x]
  53. Front End Sheet Metal Cross Brace- Left Side and Right Side (3) - Remove [2x]
  54. GM5864667

    Air Cleaner Outlet Duct Clamp (1) - Loosen

  55. Air Cleaner Outlet Duct (2) - Reposition
  56. Air Cleaner Outlet Duct Clamp (3) - Loosen
  57. Auxiliary Air Cleaner Outlet Duct (4) - Reposition
  58. GM5862960

    Disconnect the 2 mass airflow sensor electrical connectors.

  59. Remove all retainers from the air cleaner assembly and reposition wiring harnesses as necessary.
  60. Air Cleaner Bolt (1) - Remove
  61. Air Cleaner Assembly (2) - Remove
  62. Oil Filler Cap - Remove
  63. GM5845622

    Clamp (1) - Disengage [2x] - Hose Clamp Replacement Guidelines - Spring Type

  64. Charge Air Bypass Valve Vacuum Tank Tube (2) - Disconnect - Plastic Collar Quick Connect Fitting Service
  65. Charge Air Bypass Valve Vacuum Tank Tube (2) - Remove
  66. GM5854972

    Clamp (1) - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  67. Turbocharger Wastegate Actuator Vacuum Source Tube (2) - Disconnect - Plastic Collar Quick Connect Fitting Service
  68. Turbocharger Wastegate Actuator Vacuum Source Tube (2) - Remove
  69. GM5854948
    CAUTION:

    The Positive Crankcase Ventilation (PCV) line is tamper resistant and must always be replaced once it is removed. The fittings connected to the PCV line must also be replaced if they are damaged when the PCV line is removed. To reduce the risk of damage to the fittings, use a suitable cutting tool and carefully cut the connections away.

    Using a suitable cutting tool, carefully cut the 2 positive crankcase ventilation tube connectors (1).

  70. Positive Crankcase Ventilation Foul Air Tube (2) - Remove and DISCARD
  71. GM5860354

    Charge Air Bypass Valve Hose Clamp (1) - Loosen

  72. Charge Air Bypass Valve Hose (2) - Reposition
  73. Retainer Spring (4) - Disengage
  74. GM5860355

    Air Cleaner Outlet Duct (1) - Remove

  75. GM5875503

    Radiator Outlet Hose Clamp (1) @ Radiator Outlet Pipe - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  76. Radiator Outlet Hose (2) @ Radiator Outlet Pipe - Remove
  77. GM5875514

    Radiator Outlet Pipe Bolt (1) - Remove

  78. GM5875715

    Heater Inlet Hose Retainer (1) - Disengage

  79. Heater Inlet Hose (2) @ Heater Core - Disconnect and repositionRemove
  80. Heater Outlet Hose Clamp (3) @ Auxiliary Heater Inlet Hose Tee - Disengage - Hose Clamp Replacement Guidelines - Spring Type
  81. Heater Outlet Hose (4) @ Auxiliary Heater Inlet Hose Tee - Disconnect and reposition
  82. GM5875536

    Wiring Harness Retainer (1) - Remove [2x]

  83. GM5875557

    Radiator Outlet Pipe Bolt (1) - Remove

  84. Radiator Outlet Pipe Bolt (2) - Remove
  85. GM5875573

    Radiator Outlet Pipe (1) - Remove

  86. Radiator Outlet Pipe Seal (2) - Remove and DISCARD
  87. GM5875775

    Heater Inlet Hose Clamp (1) @ Heater Inlet and Outlet Pipe - Disengage - Hose Clamp Replacement Guidelines - Spring Type

  88. Heater Inlet Hose (2) @ Heater Inlet and Outlet Pipe - Remove
  89. Heater Outlet Hose Clamp (3) @ Heater Inlet and Outlet Pipe - Disengage - Hose Clamp Replacement Guidelines - Spring Type
  90. Heater Outlet Hose (4) @ Heater Inlet and Outlet Pipe - Remove
  91. GM5875779

    Heater Inlet and Outlet Pipe Bolt (1) - Remove [2x]

  92. GM5875797

    Heater Inlet and Outlet Pipe (1) - Remove

  93. Heater Outlet Pipe Gasket (2) - Remove and DISCARD
  94. Heater Inlet Pipe Seal (3) - Remove and DISCARD
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