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Chevy Blazer Coolant Leak(s)

Q. I have a 1997 Chevy Blazer 4x4 4.3 liter Vortex engine with A/C. It has about 50,000 miles on it. I have a leak of antifreeze running down center of block flowing freely. My guess is water pump. How hard is it to change. Can you give me step by step instructions? What is a good repair manual to buy?


Chevy Blazer Coolant Leak(s)

A. You need to be careful here! There could be a couple of leaks. The intake manifold gaskets leak at the corners at this mileage. The water pumps can go any time. These are also known to have build up of rusty mud in the radiator. A pressure test should help in pinpointing the leak(s).

The water pump is a fairly easy job. A Motors repair manual or Chilton manual would be a good start. If you have the mud, there is a fairly involved flushing procedure from a Chevrolet service bulletin to follow.


  1. Drain the coolant from the radiator.
  2. Remove the drive belt.
  3. Remove the upper fan shroud.
  4. Remove the cooling fan.
  5. Remove the cooling fan clutch.
  6. Remove the coolant pump drive pulley.
  7. Loosen the radiator outlet hose clamp.
  8. Remove radiator outlet hose from the coolant pump.
  9. Remove the coolant pump attaching bolts.
  10. Remove the coolant pump from the engine.
  11. Remove the coolant pump gaskets.
  12. Be sure all mating surfaces are clean and free of gasket material or burs.
Chevy Blazer Coolant Leak(s)


  1. Install the coolant pump gaskets.
  2. Install the coolant pump to the engine.
  3. Apply GM P/N 1052080 (or equivalent) sealant to the bolt threads.
  4. Install the coolant pump attaching bolts
  5. Tighten the attaching bolts to 30 foot pounds.
  6. Place the radiator outlet hose clamp loosely on the end of the hose.
  7. Connect the radiator outlet hose to the coolant pump.
  8. Tighten the radiator hose clamp.
  9. Install the coolant pump drive pulley.
  10. Install the fan clutch.
  11. Install the cooling fan.
  12. Install the multiple ribbed accessory drive belt.
  13. Install the upper fan shroud.
  14. Fill the radiator with the specified coolant and concentration.
  15. Check the cooling system for leaks.

Additional Information provided courtesy of AllDATA

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© 2005 Vincent T. Ciulla

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