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How do I change the water pump on a 1999 Grand Prix?

1. Drain Cooling System

- Place a drain pan under the radiator/water pump.

- Locate and remove the petcock or drain plug to allow the coolant to drain.

2. Remove Serpentine Belt

- Locate the tensioner for the serpentine belt.

- Using the proper size wrench or pry bar, turn the tensioner to relieve the belt tension..

- With belt tension released you should be able to pry the serpentine belt and remove it.

3. Remove Fan Shroud

- Locate the fan shroud bolts/screws.

- Remove all the bolts/screws and remove the shroud assembly from the engine compartment.

4. Remove Water Pump Bolts

- Locate the bolts that hold the water pump to the engine block.

- Remove all the bolts and nuts.

5. Remove Water Pump

- Gently pry water pump assembly off the engine block.

- Take a look at the old gasket material and clean off the surface using a gasket scraper or wire brush.

6. Install Water Pump

- Put a thin coat of sealant on the gasket side of the water pump.

- Put another thin layer of sealant onto the mating service on the engine block.

- Place the water pump gasket onto the engine block and install the water pump.

- Torque the water pump bolts per specifications of the vehicle.

7. Reinstall Fan Shroud

- Reinstall the fan shroud.

- Install all bolts/screws and make sure its secured to the vehicle.

8. Reinstall Serpentine Belt

- Locate the serpentine belt tensioner.

- Using the proper size wrench or pry bar, turn the tensioner to relieve the belt tension.

- Place the serpentine belt into place around the proper pulleys and accessories.

- Slowly rotate the tensioner back and allow the tension to apply to the belt.

- Check to ensure the belt is aligned properly and all the grooves on the pulleys.

9. Refill Cooling System

- Remove the radiator cap.

- Reinstall the drain plug/petcock.

- Slowly add coolant to the designated mark line on the radiator reservoir

- Run engine for a few minutes and watch for any leaks in the cooling system.

- Check the coolant level and add more if needed.