This is a general outline; specifics may vary slightly depending on the engine (Northstar V8 is common for this year). Always consult a repair manual specific to your vehicle's year and engine for detailed instructions and torque specifications. A Haynes or Chilton manual would be very helpful.
Tools You'll Likely Need:
* Repair Manual: Absolutely essential.
* Jack and Jack Stands: Safety first!
* Wheel Chocks: For added safety.
* Socket Set (Metric): Various sizes, including deep sockets.
* Wrenches (Metric): Combination and open-end.
* Ratchet and Extensions: For reaching tight spots.
* Torque Wrench: Crucial for proper tightening to prevent damage.
* Drain Pan: For coolant.
* New Water Pump: Make sure it's the correct one for your engine.
* New Thermostat (Recommended): While you're in there, it's a good idea to replace this.
* New Water Pump Gasket: Usually comes with the water pump, but check.
* New Coolant: The correct type for your car.
* Pliers: Various types, including needle-nose.
* Screwdrivers (Phillips and Flathead):
* Cooling System Flush Kit (Recommended): Helps remove old coolant and debris.
General Steps (Consult your repair manual for precise details):
1. Safety First: Disconnect the negative battery terminal. Raise the vehicle safely using a jack and jack stands. Secure the wheels with wheel chocks.
2. Drain the Coolant: Locate the drain plug on the engine block or radiator and drain the coolant into a suitable container.
3. Remove Accessories: Depending on your engine and the access required, you may need to remove various components like the serpentine belt, pulleys, and possibly some hoses to access the water pump. This is often the most time-consuming part. Take photos as you go to aid reassembly.
4. Remove the Water Pump: This usually involves removing bolts securing the water pump to the engine block. They can be stubborn, so use penetrating oil if needed.
5. Clean the Surface: Carefully clean the mating surfaces of the engine block and the water pump to ensure a good seal.
6. Install the New Water Pump: Install the new water pump with its new gasket, ensuring it's properly seated. Tighten the bolts to the specifications in your repair manual.
7. Reassemble: Reinstall all components removed earlier, paying close attention to routing of hoses and belts.
8. Refill and Bleed the Cooling System: Refill the cooling system with the correct type and amount of coolant. Bleed the system to remove any air pockets. This usually involves running the engine for a few minutes and checking for leaks. Consult your repair manual for the proper bleeding procedure.
9. Check for Leaks: Run the engine and thoroughly check for any leaks around the water pump and other connections.
10. Lower the Vehicle: Carefully lower the vehicle from the jack stands.
Important Notes:
* Torque Specifications: Use a torque wrench to tighten bolts to the manufacturer's specifications. Over-tightening can damage the engine block or water pump.
* Coolant Type: Use the correct type of coolant specified in your owner's manual. Mixing different types can be damaging.
* Professional Help: If you're not comfortable with any of these steps, it's always best to seek professional help from a qualified mechanic. A botched repair can lead to significant engine damage.
This is a simplified overview. Always refer to a repair manual specific to your 1999 Cadillac Eldorado for detailed instructions and diagrams. The process can be significantly more complex than this general description. Again, if in doubt, seek professional help.
