Chevrolet Blazer/Jimmy 1969-1982 Repair Guide

Radiator

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REMOVAL & INSTALLATION




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

1969-72 Engines


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Fig. Fig. 1 Exploded view of a typical radiator mounting

  1. Drain the radiator and remove the hoses.
  2.  
  3. Disconnect and plug the automatic transmission cooler lines.
  4.  
  5. On six cylinder engines, remove the finger guard.
  6.  
  7. Remove the upper retainers with the fan shroud attached (V8 models) and rest the fan shroud over the engine.
  8.  
  9. Lift the radiator out of the lower retainers.
  10.  
  11. Installation is the reverse of removal. Fill the cooling system, check the automatic transmission fluid level and run the engine, checking for leaks.
  12.  

1973-82 Engines


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Fig. Fig. 2 The fan shroud must be removed to gain access to the radiator retainers-diesel engines



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Fig. Fig. 3 Location of the oil cooler lines connection points-diesel engines



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Fig. Fig. 4 To remove the radiator, open the draincock, drain the system and disconnect the radiator hoses



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Fig. Fig. 5 If equipped, remove the coolant recovery system hose clamp ...



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Fig. Fig. 6 ... then disconnect the hose from the radiator



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Fig. Fig. 7 Loosen the upper radiator support bolts ...



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Fig. Fig. 8 ... then remove the support



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Fig. Fig. 9 Remove the fan shroud and rest it on the cooling fan to gain access to the radiator bolts



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Fig. Fig. 10 Unfasten the retainers and remove the radiator assembly from the vehicle

  1. Drain the radiator. On some 1973 models, you will have to detach the lower radiator hose. Most models are equipped with a drain cock.
  2.  
  3. Disconnect the hoses and automatic transmission cooler line. Plug the cooler lines.
  4.  
  5. Disconnect the coolant recovery system hose.
  6.  
  7. If the vehicle has a fan shroud, detach the shroud and hang it over the fan to provide clearance.
  8.  
  9. Remove the mounting panel from the radiator support and remove the upper mounting pads.
  10.  
  11. Lift the radiator up and out of the truck. Lift the shroud out if necessary.
  12.  
  13. Installation is the reverse of removal. Fill the cooling system and check the automatic transmission fluid level, and run the engine, checking for leaks.
  14.  

COOLANT DRAINING, FLUSHING & REFILLING





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Fig. Fig. 11 Some models are equipped with a factory installed coolant recovery tank

Never add cold water to a hot engine. A cracked engine block or head could result.

  1. With the engine cold and the heater on, open the petcock at the bottom rear of the radiator. If your radiator doesn't have one, detach the lower hose. Remove the radiator cap. Let the coolant drain into a container.
  2.  


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

  1. Remove the single engine block drain plug on the left side of a six cylinder engine. Remove the block drain plugs from both sides of a V8 engine.
  2.  
  3. Fill the radiator with water and let it run out the radiator and engine drains until it comes out clean.
  4.  
  5. Close the petcock and replace the block drains.
  6.  
  7. Pour in the required amount of antifreeze. Fill the radiator with water.
  8.  
  9. Leave the radiator cap off, turn the heater on and start the engine. Run it until the thermostat opens, adding water as necessary. Without a coolant recovery system, the level should be 1 1 / 4 inch below the filler neck hot and 3 in. below cold. With a coolant recovery system, the radiator should be full and the level in the catch tank should be between FULL COLD and FULL HOT.
  10.  
  11. Replace the radiator cap.
  12.  

 
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