Removing water pump; do any other parts have to be removed?

Drain the cooling system.
Remove air cleaner.
Remove water pump belt cover (4 bolts)
Remove water pump drive belt by moving the belt tensioner in the direction which loosens the belt.
Remove the bypass hose
Remove the lower hose and pump cover.
Use remover/installer tool (J-38816), rotate pump assembly clockwise to remove from vehicle.
** this tool may be available for "rent" from your local auto parts store. It is necessary to prevent tearing the new pumps' seal during installation and it make removing a stuck pump much easier. Also, once you return the tool the auto parts store refunds ALL of your money.

TO REPLACE WATER PUMP.FIRST YOU HAVE TO DRAIN THE COOLANT SYSTEM. REMOVE AIR INTAKE DUCT AND RESONATOR. REMOVE THE RADIATOR SHROUD AND FAN CLUTCH ASSEMBLY REMOVE THE DRIVE BELT. REMOVE WATER PUMP PULLEY.YOU NEED A PIN SPANNER WRENCH OR STRAP WRENCH TO HOLD WATER PUMP PULLEY WHILE LOOSEN WATER PUMP PULLEY BOLTS .YOU CAN BUY STRAP WRENCH OR RENT PIN SPANNER WRENCH AT AUTO ZONE PARTS STORES OR OTHER STORES HAS TOOLS CAN BE RENT. ONCE WATER PUMP PULLEY REMOVED. REMOVE THE WATER PUMP MOUNTING BOLTS. REMOVE WATER PUMP. IF WATER PUMP STUCK YOU CAN TAP WITH SOFT FACE HAMMER OR A LONG PIECE OF ROUND WOOD.WHEN WATER REMOVED.YOU NEED TO CLEAN THE SEALING SURFACE CAREFUL DONT SCRATCH SEALING SURFACE. YOU CAN BUY CAN OF SPRAY GASKET REMOVER.CLEAN SURFACE GOOD THEN WIPE WITH LACQUER THINNER OR ACETONE.THEN GET WATER PUMP NEW GASKET MATCH HOLES UP WITH GASKET TO WATER PUMP. ONCE HOLES MATCH UP APPLY RTV SEALANT ON BOTH SIDES WATER PUMP GASKET. THEN PUT GASKET ON WATER PUMP THEN INSTALL WATER PUMP TO VECHICLE.TORQUE WATER PUMP BOLTS TO 89 INCH LBS .TIGHTEN WATER PUMP PULLEY BOLTS TO 18 FT LBS THEN PUT EVERY THING BACK VISA VERSA.

Hi. Normal installation would take 45 to 1 hour depends on your expertise. Here's the procedure on how to replace the power pump.

• TOOLS REQUIRED
• J-43651 Water Pump Sprocket Holding Tool

REMOVAL

1. Disconnect negative battery cable.
2. Remove air inlet tube and air cleaner assembly. Refer to "Air Cleaner Assembly Removal".
3. Drain coolant.

1. Remove exhaust manifold heat shield. IMPORTANT: Twist water feed pipe while pulling to remove it from water pump.

1. Remove thermostat and water feed assembly bolts.

1. Remove water pump sprocket access plate from front cover.

1. Install J-43651 water pump sprocket holding tool. IMPORTANT: Be sure to remove retaining bolt that is accessed from front of engine block.

1. Remove water pump retaining bolts.
2. Remove water pump assembly.

INSTALLATION

NOTICE: Prior to installing the water pump read the entire procedure. Pay special attention to avoid part damage and to ensure proper sealing.

1. Install water pump assembly.
2. Install water pump bolts. Initially finger tighten bolts

• Torque: 25 Nm (18 ft. lbs.)

1. Install the water feed tube.
2. Lubricate the feed tube O-ring with silicone gel lubricant.
3. Install water feed tube by twisting and pushing toward water pump. Take care not to tear or damage the O-ring.
4. Install thermostat housing to block bolts.

• Torque: 10 Nm (89 inch lbs.)

1. Install exhaust manifold heat shield.

1. Install air cleaner assembly and air inlet tube. Refer to "Air Cleaner Assembly Installation".
2. Connect negative battery cable.
3. Add coolant.

First of all,you will need the Northstar waterpump removal tool, You can get this from most reputable auto part stores and looks like this :-



The following link shows a selection of different manufacturers.


http://www.bizrate.com/automotive-repair-tools/northstar-water-pump/

You need to remove the air filter housing and ducting to gain easy access to the pump.

Remove the shield covering the pulley and belt. The belt is easily removed by levering the tensioner pulley.

The water pump is located at the lower radiator hose manifold where you will also find the thermostat.Remove the manifold cover and you will see the water pump.

Insert the removal tool over the pump making sure it is locked in position.You will need to use a breaker bar on the removal tool and turn the tool CLOCKWISE to release the pump (1/4 turn), or if you imagine the breaker bar being vertical, push towards the windscreen of your car,it takes quite a bit of force to unseat the pump hence the use of a breaker bar.

As for the waterpump itself, DO NOT buy anything other than AC DELCO as they are the highest quality and is a genuine GM replacement part.

Water pump part number AC Delco 252707

Installing the new pump does not require as much torque as removing the old one.
Tighten the new pump to 73 ft.lbs. making sure it is seated properly before tightening.

Don't forget to clean out the water pump housing prior to installing the new pump and don't forget to include a new water pump gasket and housing cover gasket.

It is also a good idea to install a new thermostat while you're at it.

Regards.

GM Century/Lumina/Grand Prix/Intrigue 1997-2000 Water Pump - REMOVAL & INSTALLATION

3.1L and 3.4L (VIN E) Engines

1. Disconnect the negative battery cable.


2. Partially drain the cooling system into a suitable container.
3. Remove the drive belt guard.
4. Loosen the water pump pulley bolts before removing the drive belt. This should help keep the pulley from turning as the bolts are loosened.
5. Remove the drive belt. Please see .
6. Remove the water pump pulley bolts and remove the pulley.
7. Remove the water pump bolts and separate the pump from the engine front cover.

To install:



Fig. Exploded view of the water pump and front cover arrangement-3.1L and 3.4L (VIN E) engines

1. Clean all parts well. Use care when scraping gasket material from the front cover and the pump. Do not gouge aluminum parts. Clean the bolt threads well. The torque specification is low and if the bolt threads are dirty, an accurate torque is not possible and leaks are likely to develop.
2. Using a new gasket, install the water pump to the front cover. Install the cleaned and lightly lubricated water pump bolts. Torque to 89 inch lbs. (10 Nm).
3. Install the water pump pulley and bolts and torque to 18 ft. lbs. (25 Nm).
4. Install the remaining components in the reverse order of the removal process. When refilling the cooling system, use the proper mix of DEX-COOL® and water. Check for leaks.

3.4L (VIN X) Engine

1. Disconnect the negative battery cable.
2. Partially drain the cooling system into a suitable container.
3. Remove the coolant recovery reservoir.
4. Remove the drive belt. Please see .
5. Remove the pulley bolts and separate the pulley from the water pump.
6. Remove the water pump bolts and remove the pump from the engine.

Fig. Exploded view of the water pump mounting-3.4L (VIN X) engine
To install:

1. Clean all parts well. Use care when scraping gasket material from the front cover and the pump. Do not gouge aluminum parts. Clean the bolt threads well. The torque specification is low and if the bolt threads are dirty, an accurate torque is not possible and leaks are likely to develop.
2. Using a new gasket, install the water pump to the front cover. Install the cleaned and lightly lubricated water pump bolts. Torque to 89 inch lbs. (10 Nm).
3. Install the water pump pulley and bolts and finger-tighten the bolts.
4. Install the drive belt, then torque the pulley bolts to 18 ft. lbs. (25 Nm).
5. Install the remaining components in the reverse order of the removal process. When refilling the cooling system, use the proper mix of DEX-COOL® and water. Check for leaks.

Hope this help (remember comment and rated this).

www.autozone.com

They can get all the parts. They also provide haynes repair manuals, any special tools (probably not required for this vehicle) and any special disassembly instructions.

I hope this helps.

The text below is from the GM Service manual 4.3L V6 Engine
Water Pump Replacement (4.3L)
Removal Procedure
Drain the cooling system. Refer to Draining and Filling Cooling System .
Loosen the water pump pulley bolts.
Remove the cooling fan and clutch assembly.

Tools Required
J 46406 Fan Clutch Wrench

Removal Procedure
Remove the upper fan shroud.
Remove the fan clutch from the water pump in a counterclockwise direction using the J 46406 .
Remove the fan clutch assembly.
Remove the drive belt. Refer to Drive Belt Replacement Remove the water pump pulley mounting bolts.
Remove the water pump pulley.
Remove the radiator outlet hose clamp from the water pump.
Remove radiator outlet hose from the water pump.
Remove the water pump mounting bolts.
Remove the water pump from the engine.
Remove the water pump gaskets.
Clean the water pump gasket mating surfaces.
Installation Procedure
Install the water pump gaskets.
Install the water pump to the engine.
Apply a sealer (GM P/N 12346004) to the bolt threads.
Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the water pump mounting bolts.
Tighten
Tighten the mounting bolts to 41 N·m (30 lb ft).
Install the radiator outlet hose to the water pump.
Install the water pump pulley.
Install the water pump pulley bolts.
Tighten
Tighten the water pump pulley bolts to 25 N·m (18 lb ft).
Install the drive belt. Refer to Drive Belt Replacement in Engine Mechanical - 4.3L.
Install the fan clutch assembly.
Fill the radiator cooling system. Refer to Draining and Filling Cooling System .
Inspect the cooling system for leaks.

Remove radiator and fan and anything that will block you from getting to the water pump. Take pictures of each step that you disconnected all parts getting to the water pump and the removal of the water pump with a digtal camera and take the pump to the parts dealer so that you get an exact match. Next read the instructions that come with the pump. Clean all old gasket and glue off of the place where you will install the new water pump. Next take your last picture you take and reverse the order and reinstall the gasket/sealer and water pump and all other parts. Use a tork wrench on the bolts. Add water and anti-freeze to the radiator and start the car and look for leaks.

Removal

1. NOTE: Install the memory saver.
   Disconnect the battery ground cable.

1. Drain the cooling system. Refer to Cooling System Draining, Filling and Bleeding in this Section.

1. Remove the wheel.

1. Remove the right - hand side lower splash shield.
   1. Remove the bolts.
   1. Remove the splash shield.

1. Lower the vehicle.

1. Loosen the water pump pulley bolts.

1. Remove the accessory drive belt. For additional information, refer to Section 303-05.

1. Using the special tool, remove the crankshaft pulley.

1. Remove the water pump pulley.
   1. Remove the bolts.
   1. Remove the pulley.

1. Remove the water pump bolts.

1. NOTE: Water pump must be turned 180° to remove from the vehicle.
   Remove the water pump.

1. Remove the alternator & power steering pump drive belts.
2. Remove four (4) 10mm bolts holding the water pump pullys & remove the pullys.
3. Drain the Radiator (save coolant if intend to reuse).
4. Loosen & remove AC compressor belt.
5. Remove crankshaft pully (22mm bolt).
6. Remove lower timing belt cover (10 mm bolts) to access water pump bolts.
7. Remove the water pump (12mm bolts)
(1) Remove the 2 bolts, then remove the alternator brace (A). (2) Remove the water pump (B) and gasket.
8. Clean mating surface on engine & install new gasket & pump - reassemble. Refill w/50-50 coolant.