Question about 2004 Pontiac Grand Prix

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When changing out the water pump, do you have to remove the fuse box? If so I see 2 nuts at the top , what holds the bottom on?

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Yes, the the fuse block has to be moved out of the way, also the the power steering mounting bracket will need to be moved.
This should expose the pump bolts.

Posted on Sep 29, 2010


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How to replace the water pump

Water Pump
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.

2S-ELC Engines

  1. Drain the cooling system.
  2. Remove the timing belt as described in this section.
  3. Remove the alternator adjusting bar.
  4. Disconnect the lower radiator hose from the water inlet housing.

    Fig. 1: Exploded view of the water pump mounting

  5. Disconnect the water temperature switch from the water inlet housing.
  6. Disconnect the water by-pass hose from the water pump.
  7. Remove the two heater pipe clamp bolt. Remove the two nuts and heater pipe
    with gasket. Replace the gasket.
  8. Loosen the three water pump mounting bolts in the indicated sequence.

    Fig. 2: Water pump bolt loosening sequence for 2S-ELC and 3S-FE

  9. Remove the water pump and O-ring. If the water pump is stubborn, tap it a
    few times with a rubber mallet.
  10. Installation is the reverse of removal. Make sure all the water pump and
    engine contact surfaces are clean and install the new O-ring into the pump cover
  11. Install the water pump with the three bolts. Tighten the bolts in sequence
    to 82 inch lbs. (9 Nm).
  12. Fill the cooling system to the proper level with a good brand of ethylene
    glycol based coolant. Start the engine and inspect for leaks.

3S-FE Engines

  1. Drain the cooling system.
  2. Disconnect the water temperature switch connector from the water inlet
  3. Disconnect the lower radiator hose from the water inlet housing.
  4. Remove the timing belt and timing belt pulleys as described in this section.

  5. Remove the two nuts attaching the water by-pass pipe to the water pump
  6. Remove the three water pump-to-engine attaching bolts.
  7. Pull the water pump and the water pump cover out from the engine.
  8. Remove the two O-rings and gasket. Discard them and replace with new.
  9. Installation is the reverse of removal. Secure the water pump onto the
    engine and install the three bolts. Tighten the bolts in an alternate pattern to
    82 inch lbs. (9 Nm). Install the by-pass pipe attaching nuts and tighten them to
    82 inch lbs. (9 Nm) also.
  10. Fill the cooling system to the proper level with coolant.
  11. Start the engine and check for leaks.

5S-FE Engine

  1. Drain the engine coolant.
  2. Remove the timing belt.
  3. Remove the No. 1 idler pulley and tension spring. Remove the No. 2 idler
  4. Disconnect the lower radiator hose at the water inlet.
  5. Remove the alternator belt adjusting bar.
  6. Loosen the two nuts and disconnect the water by-pass pipe.
  7. Remove the three pump mounting bolts in sequence (middle, top, bottom) and
    then pull out the water pump and cover. Remove the gasket and two O-rings.

    Fig. 3: Bolt removal sequence for 5S-FE engines

    To install:

  8. Replace the two O-rings and gasket with new ones, coat the by-pass O-ring
    with soapy water and then connect the pump cover to the by-pass pipe. Do not
    install the nuts yet!
  9. With the pump loosely connected to the pipe, install the pump and tighten
    the three bolts to 82 inch lbs. (9 Nm), in sequence (top, bottom, middle).
    Install the two by-pass pipe nuts and tighten them to 78 inch lbs. (9 Nm).
  10. The remainder of installation is the reverse of removal. Tighten each
    component to specifications.

2VZ-FE and 3VZ-FE Engines

  1. Drain the engine coolant.
  2. Disconnect the lower radiator hose at the water inlet.
  3. Disconnect the timing belt from the water pump pulley.
  4. Remove the bolt holding the inlet pipe to the alternator belt adjusting bar
    and then remove the inlet pipe and O-ring.
  5. Remove the water inlet and thermostat.
  6. Remove the seven bolts and then pry off the water pump.
    To install:

  7. Scrape any remaining gasket material off the pump mating surface. Apply a
    0.08-0.12 inch (2-3mm) bead of sealant to the groove in the pump and then
    install the pump. Tighten the bolts to 14 ft. lbs. (20 Nm).

    Fig. 4: Apply sealant on the surface of the water pump as shown


  8. The remainder of installation is the reverse of removal. Tighten each
    component to specifications. Connect the radiator hose and fill the engine with

1MZ-FE Engine

  1. Drain the engine coolant.
  2. Remove the timing belt.
  3. Mark the left and right camshaft pulleys with a touch of paint. Using a
    spanner wrench, remove the bolts to the right and left camshaft pulleys.
    Separate the pulleys from the engine. Be sure not to mix up the pulleys.
  4. Remove the No. 2 idler pulley by removing the bolt.
  5. Disconnect the three clamps and engine wire from the rear timing belt cover.

  6. Remove the six bolts holding the No. 3 timing belt cover to the engine

    Fig. 5: Unbolt the No. 3 timing belt cover from the engine

  7. Remove the bolts and nuts to the extract the water pump.

    Fig. 6: Water pump mounting bolt and nut locations

  8. Raise the engine slightly and remove the water pump and the gasket from the

    Fig. 7: Pull the water pump from the engine and remove it from
    the vehicle

    Fig. 8: Always discard the old gasket

    To install:

  9. Check that the water pump turns smoothly. Also check the air hole for
    coolant leakage.
  10. Using a new gasket, apply liquid sealer to the gasket, water pump and engine
  11. Install the gasket and pump to the engine and install the four bolts and two
    nuts. Tighten the nuts and bolts to 53 inch lbs. (6 Nm).
  12. The remainder of installation is the reverse of removal. Tighten each
    component to specifications.

    • Rear timing belt cover - 74 inch lbs. (9 Nm).
    • No. 2 idler pulley - 32 ft. lbs. (43 Nm)

  13. Fill the engine coolant. Connect the negative battery cable to the battery
    and start the engine.
  14. Top off the engine coolant and check for leaks.

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1995 BUICK PARK AVENUE Water pump replacement


Here is how you do it step by step;

STEP 1. Loosen the bolts on the water pump flywheel then remove the belt.

STEP 2. Take a oil-pan length 2x4 and use it in betwen jack and oil pan and jack up engine almost so that steering pump fluid cover on top side almost hits cross bar.

STEP 3 Remove the center bolt of the motor mount holding the two halves of the mount together.

STEP 4 Remove two bolts and one nut on the engine side mount. Remove 4 bolts (2 on top and two hidden on side) of the bolts holding the mount to the frame.

STEP 5. Now take a big 2x4 and wedge it so as to move the engine to the driver side of the compartment. At the same time rotate and move the mount piece on the engine side rotating about the stud [that the nut came off of]so as to paritally split apart the two mount halves. You'll see that you can now get at the two hidden bolts.

SEP 6. Remove the water pump pulley wheel. There are a bunch of small and little bolts in the water pump...some on bottom side.

STEP 7 Remove them and old pump and Scrape off old gasket.

STEP 8. Apply new gasket and sealer to new pump and reverse order to install.

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