Safety First:
* Disconnect the negative battery terminal before starting any work.
* Allow the engine to cool completely before working near the water pump. Hot coolant can cause serious burns.
* Wear safety glasses and gloves.
* Work in a well-ventilated area. Coolant is toxic.
Tools You'll Likely Need:
* Repair manual specific to your 1999 Chevy Suburban's engine
* Socket set (metric)
* Wrenches (metric)
* Pliers
* Screwdrivers (Phillips and flathead)
* Drain pan
* New water pump and gasket
* Coolant (the correct type for your Suburban)
* Jack and jack stands (essential for safe working conditions)
* Ratchet and extensions
* Possibly a harmonic balancer puller (depending on the engine)
General Steps (This is NOT a comprehensive guide, consult your repair manual):
1. Drain the coolant: Locate the drain plug on the radiator and engine block (if applicable). Place a drain pan underneath and carefully open the drain plugs to drain the coolant.
2. Remove the serpentine belt: Use a belt wrench or similar tool to loosen the tensioner and remove the serpentine belt. Note the routing of the belt for proper reinstallation.
3. Remove the water pump pulley: This may require special tools depending on the design. Some have bolts, others may require a puller.
4. Remove the water pump: This often involves removing several bolts securing the pump to the engine block. Access may be tight, requiring the use of extensions and wobble extensions on your ratchet.
5. Replace the gasket: Clean the mating surfaces of the engine block and the new water pump thoroughly. Install the new gasket on the water pump.
6. Install the new water pump: Carefully install the new water pump, ensuring it's seated correctly. Tighten the bolts to the manufacturer's specified torque.
7. Reinstall the pulley: Put the pulley back on and tighten securely.
8. Reinstall the serpentine belt: Refer to your repair manual or the diagram you made to reinstall the belt correctly.
9. Refill the coolant: Carefully add the correct type and amount of coolant to the radiator and overflow reservoir. Consult your owner's manual for the correct coolant mixture.
10. Check for leaks: Start the engine and let it run for a few minutes. Check carefully for any leaks around the water pump and hoses.
11. Bleed the cooling system: Air may be trapped in the system. Consult your repair manual for the proper bleeding procedure. This is crucial to prevent overheating.
Important Considerations:
* Timing Chain/Belt: On some engines, accessing the water pump may require partially removing or disassembling parts of the timing system. This is a very complex process and should only be attempted by experienced mechanics.
* Thermostat: While not strictly necessary, many people replace the thermostat at the same time as the water pump, as it's relatively inexpensive and easily accessible while the pump is out.
* Professional Help: If you are not comfortable with automotive repair, take your Suburban to a qualified mechanic. Improperly replacing the water pump can lead to serious engine damage.
This is a general outline, and the specific steps may vary significantly depending on your engine. Always consult a repair manual specific to your 1999 Chevy Suburban's engine before starting this repair. A Haynes or Chilton manual can be a valuable resource. Failing to follow the instructions in a repair manual specific to your vehicle could lead to damage or injury.
