GM S-Series Pick-ups and SUV's 1994-1999 Repair Guide

Water Pump

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REMOVAL & INSTALLATION



See Figures 1 through 13



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Fig. Fig. 1: After removing the cooling fan assembly, remove the water pump pulley-4.3L engine



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Fig. Fig. 2: Location the water pump pulley bolts-2.2L engine



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Fig. Fig. 3: If the pulley turns when you try to loosen the bolts, attach sockets and ratchets to two of the bolts, insert a prybar to hold the pulley in place and loosen the bolts-2.2L engine



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Fig. Fig. 4: Once all the bolts are unfastened, remove the water pump pulley-2.2L engine



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Fig. Fig. 5: Disconnect all hoses attached to the water pump assembly-4.3L engine



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Fig. Fig. 6: Unfasten and remove the water pump retaining bolts-4.3L engine



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Fig. Fig. 7: The water pump is retained by four bolts-2.2L engine



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Fig. Fig. 8: Remove the water pump from the vehicle-4.3L engine



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Fig. Fig. 9: Removing the water pump from the engine block-2.2L engine



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Fig. Fig. 10: Use a scraper to clean the old gasket material from the water pump ...



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Fig. Fig. 11: ... and the water pump-to-engine mating surface


CAUTION
Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, 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 quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Disconnect the negative battery cable, then drain the engine cooling system.
  2.  
  3. Relieve the belt tension, then remove the drive belt.
  4.  
  5. Remove the upper fan shroud, then remove the fan or fan and clutch assembly, as applicable.
  6.  
  7. Remove the water pump pulley.
  8.  
  9. If applicable, loosen the clamp(s) and disconnect the coolant hose(s) from the water pump.
  10.  



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Fig. Fig. 12: Water pump mounting-2.2L gasoline engine

  1. Unfasten the retainers, then remove the water pump from the engine. Note the positions of all retainers as some engines will utilize different length fasteners in different locations and/or bolts and studs in different locations.
  2.  

To install:
  1. Using a putty knife, carefully clean the gasket mounting surfaces.
  2.  

The water pumps on some of the engines covered by this guide, may have been installed using sealer only, no gasket, at the factory. If a gasket is supplied with the replacement part, it should be used. Otherwise, a1/8in. (.125mm) bead of RTV sealer should be used around the sealing surface of the pump.

  1. Apply 1052080 or an equivalent sealant to the threads of the water pump retainers. Install the water pump to the engine using a new gasket, then thread the retainers in order to hold it in position.
  2.  
  3. Tighten the water pump retainers to specification:
    1. For the 2.2L engines tighten the water pump-to-engine retainers to 18 ft. lbs. (25 Nm).
    2.  
    3. For the 4.3L engine, tighten the bolts and studs to 30 ft. lbs. (41 Nm).
    4.  

  4.  



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Fig. Fig. 13: Water pump mounting-4.3L engine (note that stud locations may vary)

  1. If removed, connect the coolant hose(s) and secure using the retaining clamp(s).
  2.  
  3. Install the water pump pulley, then install the fan or fan and clutch assembly.
  4.  
  5. Position the serpentine belt over the pulleys, then carefully allow the tensioner back into contact with the belt.
  6.  
  7. Install the upper fan shroud, then connect the negative battery cable.
  8.  
  9. Properly refill the engine cooling system, then run the engine and check for leaks.
  10.  

 
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