GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 Sierra Classic - 4WD 🢒 Body Repair 🢒 Bolted Exterior Body Panels and Closures 🢒 Radiator Support Replacement

Removal Procedure

Caution: Refer to Battery Disconnect Caution in the Preface section.

  1. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
  2. Disable the supplemental inflatable restraint (SIR). Refer to SIR Disabling and Enabling .
  3. Remove the air intake duct. Refer to one of the following procedures:
    4. •  Air Cleaner Outlet Resonator Replacement for the 4.3L engine
    •  Air Cleaner Resonator Outlet Duct Replacement for the 4.8L, 5.3L and 6.0L engine
    •  Air Cleaner Outlet Duct Replacement for the 6.6L (LBZ and LLY) engine
    •  Intake Air Resonator Replacement for the 8.1L engine
  4. Remove the air cleaner assembly. Refer to one of the following procedures:
    5. •  Air Cleaner Assembly Replacement for the 4.3L engine
    •  Air Cleaner Assembly Replacement for the 4.8L, 5.3L and 6.0L engine
    •  Air Cleaner Assembly Replacement for the 6.6L (LBZ and LLY) engine
    •  Air Cleaner Assembly Replacement for the 8.1L engine
  5. Remove the grille. Refer to Grille Replacement .
  6. Remove the front bumper. Refer to Front Bumper Replacement .
  7. Remove the inflatable restraint front end discriminating sensor. Refer to Inflatable Restraint Front End Sensor Replacement .
  8. Remove the headlamps. Refer to Headlamp Assembly or Headlamp Bulb Replacement .
  9. Remove the park/turn signal lamp assemblies. Refer to Parking and Turn Signal Lamp Replacement .
  10. Remove the hood latch release bracket and reposition the release cable. Refer to Hood Primary and Secondary Latch Replacement .
  11. Remove the tie bar, if equipped. Refer to Front End Upper Tie Bar Replacement .

    12. Object Number: 370330 Size: SH
  12. Unscrew the headlamp housing support (1) from the tie bar (2). The 15 series lower mounting position is shown. The 25 series mounting position is similar.
  13. Disconnect the horn electrical connector.
  14. Remove the radiator. Refer to Radiator Replacement .
  15. Remove the auxiliary transmission oil cooler, if equipped. Refer to Transmission Fluid Auxiliary Cooler Replacement .
  16. Remove the upper air baffles. Refer to Radiator Air Upper Baffle and Deflector Replacement .
  17. Remove the side air baffle. Refer to Radiator Air Side Baffle and Deflector Replacement .
  18. Remove the power steering cooler mounting bolts and reposition the cooler.

    19. Object Number: 397231 Size: SH
  19. Disconnect the electrical connector from the automatic recirculation switch.
  20. Remove the A/C condenser, if equipped. Refer to Condenser Replacement .

    21. Object Number: 370698 Size: SH
  21. Remove the upper washer reservoir bolt (1) from the tie bar (2).
  22. Remove the battery tray. Refer to Battery Tray Replacement .

    23. Object Number: 401108 Size: SH
  23. Remove the lower washer reservoir bolt (1) from the tie bar (2).

    24. Object Number: 401544 Size: SH
  24. Remove the battery tray support.
  25. Remove the air cleaner mounting bracket. Refer to Air Cleaner Bracket Replacement .

    26. Object Number: 401168 Size: SH
  26. Remove the front upper and lower fender bolts (1) from the tie bar/radiator support (2). The left fender is shown, the right is similar. Refer to Front Fender Replacement - Left Side and to Front Fender Replacement - Right Side .

    27. Object Number: 402774 Size: SH
  27. Remove the lower radiator support nut and bolt at the frame (1).

    28. Object Number: 370884 Size: SH
  28. Remove the radiator support baffle (2).
  29. Remove the radiator support (1) from the frame.
  30. Remove the horns from the radiator support. Refer to Horn Replacement - Left Side or to Horn Replacement - Right Side .

Installation Procedure

  1. Install the horns onto the radiator support. Refer to Horn Replacement - Left Side or to Horn Replacement - Right Side .

    2. Object Number: 370884 Size: SH
  2. Position the radiator support (1) onto the frame.
  3. Install the radiator support baffle (2).

    4. Notice: Refer to Fastener Notice in the Preface section.


    Object Number: 402774 Size: SH
  4. Install the lower radiator support nut and bolt at the frame (1).

    5. Tighten
    Tighten the radiator support nut to 70 N·m (52 lb ft).


    Object Number: 401168 Size: SH
  5. Install the front upper and lower fender bolts (1) to the tie bar/radiator support (2). The left fender is shown, the right is similar. Refer to Front Fender Replacement - Left Side and Front Fender Replacement - Right Side .

    6. Tighten
    Tighten the front fender bolts to 25 N·m (18 lb ft).


    Object Number: 401544 Size: SH
  6. Install the battery tray support.

    7. Tighten
    Tighten the battery tray support bolts to 9 N·m (80 lb in).

  7. Install the battery tray. Refer to Battery Tray Replacement .
  8. Install the air cleaner mounting bracket. Refer to Air Cleaner Bracket Replacement .

    9. Object Number: 401108 Size: SH
  9. Install the lower washer reservoir bolt (1) to the tie bar (2).

    10. Tighten
    Tighten the washer reservoir bolt to 9 N·m (80 lb in).


    Object Number: 370698 Size: SH
  10. Install the upper washer reservoir bolt (1) to the tie bar (2).

    11. Tighten
    Tighten the reservoir bolt to 9 N·m (80 lb in).

  11. Install the A/C condenser, if equipped. Refer to Condenser Replacement .

    12. Object Number: 397231 Size: SH
  12. Connect the electrical connector to the automatic recirculation switch.
  13. Reposition the power steering cooler and install the mounting bolts.
  14. Install the side air baffles. Refer to Radiator Air Side Baffle and Deflector Replacement .
  15. Install the upper air baffles. Refer to Radiator Air Upper Baffle and Deflector Replacement .
  16. Install the auxiliary transmission oil cooler, if equipped. Refer to Transmission Fluid Auxiliary Cooler Replacement .
  17. Install the radiator. Refer to Radiator Replacement .
  18. Connect the horn electrical connector. Refer to Horn Replacement - Left Side or to Horn Replacement - Right Side .

    19. Object Number: 370330 Size: SH
  19. Install the headlamp housing support (1) to the tie bar (2). The 15 series lower mounting position is shown. The 25 series mounting position is similar.

    20. Tighten
    Tighten the screws to 9 N·m (80 lb in).

  20. Install the tie bar, if equipped. Refer to Front End Upper Tie Bar Replacement .
  21. Install the hood latch release bracket and cable. Refer to Hood Primary and Secondary Latch Replacement .
  22. Install the park/turn signal lamp assemblies. Refer to Parking and Turn Signal Lamp Replacement .
  23. Install the headlamps. Refer to Headlamp Assembly or Headlamp Bulb Replacement .
  24. Install the inflatable restraint front end discriminating sensor. Refer to Inflatable Restraint Front End Sensor Replacement .
  25. Install the front bumper. Refer to Front Bumper Replacement .
  26. Install the grille. Refer to Grille Replacement .
  27. Install the air cleaner assembly. Refer to one of the following procedures:
    28. •  Air Cleaner Assembly Replacement for the 4.3L engine
    •  Air Cleaner Assembly Replacement for the 4.8L, 5.3L and 6.0L engine
    •  Air Cleaner Assembly Replacement for the 6.6L (LBZ and LLY) engine
    •  Air Cleaner Assembly Replacement for the 8.1L engine
  28. Install the air intake duct. Refer to one of the following procedures:
    29. •  Air Cleaner Outlet Resonator Replacement for the 4.3L engine
    •  Air Cleaner Resonator Outlet Duct Replacement for the 4.8L, 5.3L and 6.0L engine
    •  Air Cleaner Outlet Duct Replacement for the 6.6L (LBZ and LLY) engine
    •  Intake Air Resonator Replacement for the 8.1L engine
  29. Enable the SIR. Refer to SIR Disabling and Enabling .
  30. Connect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .