GM Blazer/Jimmy/Typhoon/Bravada 1983-1993 Repair Guide

Radiator

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DIAGNOSIS



Test for restrictions in the radiator by warming the engine to operating temperature and then turning the engine off. CAREFULLY feel the radiator, it should be hot along the left side and warm along the right side. The temperature should rise evenly from right to left. If cold spots are felt, have the radiator tested for clogged sections.

For more information on cooling system maintenance and service, please refer to General Information & Maintenance in this information.

REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine cooling system.
  4.  



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Fig. Fig. 1: Exploded view of a common radiator and shroud mounting

  1. If equipped with the MFI-Turbo engine:
    1. Remove the air cleaner and duct, then remove the turbocharger inlet elbow.
    2.  
    3. Disconnect the positive battery cable, then remove the battery and the battery tray.
    4.  
    5. Disconnect the heater hose and clamp from the radiator.
    6.  

  2.  
  3. Disconnect the overflow hose from the radiator, then disconnect the upper and lower radiator hoses.
  4.  
  5. If equipped with A/C, it may be necessary to remove the A/C hose retaining clip and reposition the hose for shroud and/or radiator removal. DO NOT disconnect any refrigerant fittings.
  6.  

If equipped with a 1-piece shroud, then shroud may be unbolted from the radiator support and pushed back over the cooling fan instead of removing it completely.

  1. Most vehicles covered by this information should be equipped with a 2-piece radiator/fan shroud. Remove the upper fan shroud-to-radiator support bolts and the upper fan shroud-to-lower fan shroud retainers. Remove the upper shroud from the vehicle.
  2.  



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Fig. Fig. 2: Open the radiator petcock and drain the engine cooling system



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Fig. Fig. 3: Slide the tension clamp back over the overflow hose



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Fig. Fig. 4: Pull the overflow hose from the nipple on the filler neck



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Fig. Fig. 5: Loosen the radiator hose retaining clamps

  1. If equipped with an A/T, disconnect and plug the fluid cooler lines at the radiator. Plug all openings to prevent system contamination or excessive fluid loss.
  2.  
  3. If equipped with a factory engine oil cooler which is integral to the radiator, disconnect and plug the oil cooler lines at the radiator. Plug all openings to prevent system contamination or excessive fluid loss.
  4.  
  5. Lift the radiator straight from the supports and from the vehicle. Be careful to lift the radiator straight upward and not to tilt it excessively as the radiator will still contain a significant amount of coolant and, if applicable, transmission fluid/engine oil.
  6.  

To install:
  1. Lower the radiator into position on the supports.
  2.  
  3. If equipped, remove the plugs, then connect the engine oil cooler lines and tighten the fittings.
  4.  
  5. If equipped with an A/T, remove the plugs, then connect the transmission fluid cooler lines and tighten the fittings.
  6.  
  7. Install the upper fan shroud and secure using the support and lower shroud retainers.
  8.  
  9. If applicable, reposition the A/C refrigerant hose and secure using the retaining clip.
  10.  
  11. Connect the overflow hose, upper and lower radiator hoses.
  12.  
  13. If equipped with the MFI-Turbo engine:
    1. Connect the heater hose and clamp to the radiator.
    2.  
    3. Install the battery tray, then install the battery and connect the positive battery cable
    4.  
    5. Install the turbocharger inlet elbow, then install the air cleaner and duct.
    6.  

  14.  
  15. Connect the negative battery cable.
  16.  
  17. Properly refill the engine cooling system.
  18.  



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Fig. Fig. 6: Carefully pull the hoses from the radiator



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Fig. Fig. 7: Loosen and remove the shroud-to-radiator support bolts



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Fig. Fig. 8: Remove the upper shroud to lower shroud retainers



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Fig. Fig. 9: Remove the upper shroud from the vehicle



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Fig. Fig. 10: Lift the radiator assembly from the supports

 
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