GM Full-Size Trucks 1970-1979 Repair Guide

Radiator

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See Figures 1, 2, 3, 4, 5, 6 and 7



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Fig. Fig. 1: Disconnect all hoses and lines



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Fig. Fig. 2: Unfasten the retainers ...



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Fig. Fig. 3: ... then remove the cooling fan



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Fig. Fig. 4: Common radiator, shroud and finger guard. The finger guard is usually found on trucks with 6-cylinder engines



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Fig. Fig. 5: Remove the shroud retaining bolts ...



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Fig. Fig. 6: ... then remove the fan shroud



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Fig. Fig. 7: Exploded view of the radiator mounting

REMOVAL & INSTALLATION



1970-72 Vehicles
  1. Drain the radiator into a suitable container.
  2.  
  3. Disconnect the coolant hoses.
  4.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Detach and plug the transmission cooler line (if equipped).
  2.  
  3. On 6-cylinder engines, remove the finger guard.
  4.  
  5. Remove the upper retainers with the fan shroud attached (V8 models) and rest the fan shroud over the engine.
  6.  
  7. Lift the radiator out of the lower retainers.
  8.  
  9. Installation is the reverse of removal. Fill the cooling system, check the automatic transmission fluid level and run the engine, checking for leaks.
  10.  

1973-79 Vehicles
  1. Drain the radiator. On some 1973 models, you will have to siphon the coolant out of the filler neck or detach the lower radiator hose. 1974 and later models are equipped with a drain cock.
  2.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by the ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.

  1. Disconnect the hoses and automatic transmission cooler line (if equipped). Plug the cooler lines. Diesels have transmission cooler and oil cooler lines.
  2.  
  3. Disconnect the coolant recovery system hose.
  4.  

It may be necessary to remove the fan for clearance when removing the radiator.

  1. If the vehicle is equipped with a fan shroud, detach the shroud and hang it over the fan to provide clearance.
  2.  
  3. On 6-cylinder engines, remove the finger guard.
  4.  
  5. Remove the mounting panel from the radiator support and remove the upper mounting pads.
  6.  
  7. Lift the radiator up and out of the truck. Lift the shroud out if necessary.
  8.  
  9. Reverse the above to install. Fill the cooling system and check the automatic transmission fluid level, and run the engine, checking for leaks.
  10.  

 
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