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How do you replace the water pump on a 1999 Toyota Tacoma V6?

Replacing the water pump on a 1999 Toyota Tacoma V6 involves removing the serpentine belt, cooling system drain, water pump removal and replacement, and refilling the cooling system. Here are the general steps:

Tools Needed:

- Wrench set

- Socket set

- Pliers

- Screwdriver

- Funnel

- Gasket Scraper

- Jack and jack stands

Parts Required:

- New water pump

- Gasket

- Coolant

1. Park your vehicle on a flat surface and allow the engine to cool down completely.

2. Disconnect the battery. This is a safety precaution to avoid any electrical accidents while working on the cooling system.

3. Jack up the front of the vehicle and secure it on jack stands. This will give you enough space to work under the vehicle.

4. Drain the cooling system. Place a drain pan under the radiator drain plug (usually located at the bottom of the radiator) and open the plug to allow the coolant to drain.

5. Remove the serpentine belt. Use the wrench or socket set to loosen the belt tensioner and remove the belt from the pulleys.

6. Remove the water pump bolts. There will be several bolts holding the water pump in place. Use the wrench or socket set to remove these bolts.

7. Gently pry the water pump off the engine block. Be careful not to damage the gasket surface.

8. Clean the gasket mating surfaces. Use the gasket scraper to remove any old gasket material from the engine block and water pump surfaces.

9. Apply a thin bead of sealant to the new gasket. Align the new water pump with the engine block and carefully position the gasket between them.

10. Install the water pump bolts and tighten them evenly. Make sure the water pump is securely installed.

11. Reinstall the serpentine belt. Route the belt around the pulleys and tension it properly.

12. Reinstall the radiator drain plug and fill the cooling system with coolant. Refer to your vehicle's owner manual for the correct type and quantity of coolant.

13. Bleed the cooling system. Start the engine and let it run until it reaches operating temperature. Turn on the heater to full, and look for any air bubbles in the coolant reservoir. If found, squeeze the upper and lower radiator hoses to remove trapped air.

14. Check for leaks and ensure that the cooling system is working properly. Test drive the vehicle to ensure that the engine is not overheating.

NOTE: If you are uncomfortable performing these steps yourself, it is recommended to have the water pump replaced by a professional mechanic.