Tools you'll likely need:
* Repair manual: Absolutely essential for specific procedures and torque values.
* Socket set: Various sizes, including metric and possibly SAE.
* Wrench set: Same as above.
* Screwdrivers: Phillips and flathead.
* Pliers: Needle-nose and slip-joint.
* Drain pan: To catch coolant.
* Coolant: The correct type for your vehicle.
* New water heater inlet pipe: Ensure you get the correct part for your specific engine.
* Rags or shop towels: To clean up spills.
* Possibly a breaker bar: For stubborn bolts.
General Procedure (This is a simplified overview):
1. Safety First: Disconnect the negative battery terminal. Allow the engine to cool completely before starting any work.
2. Drain Coolant: Drain the engine coolant completely. Consult your repair manual for the drain plug location(s).
3. Access the Intake Manifold: This often involves removing various components depending on your specific year and engine configuration. This *could* include:
* Air intake system: Air filter housing, air intake tube.
* Throttle body: May need to be disconnected and removed.
* Fuel injectors: Depending on the design, you might need to disconnect and possibly remove them. Be careful not to damage the fuel injectors or fuel lines.
* Other components: Various vacuum lines, sensors, and wiring harnesses may need to be disconnected and moved out of the way.
4. Remove the Old Pipe: Once you have access to the water heater inlet pipe, carefully remove it. This will likely involve removing bolts or clamps securing it to the intake manifold and possibly the heater core fitting. Take pictures or make notes as you disassemble to help with reassembly. Pay attention to the orientation of any gaskets or seals. They may be reusable, but often it's best practice to replace them.
5. Install the New Pipe: Carefully install the new water heater inlet pipe, ensuring all gaskets and seals are properly seated. Tighten all bolts and clamps to the manufacturer's specified torque.
6. Reassemble: Carefully reassemble all the components you removed in reverse order, making sure everything is properly connected.
7. Refill Coolant: Refill the cooling system with the correct type and amount of coolant. Consult your repair manual for the proper procedure, including bleeding the air from the system.
8. Check for Leaks: Start the engine and check for any leaks around the new pipe and other connections. Let the engine run for a while to ensure the system is properly bled.
Important Considerations:
* Year and Model Specificity: This is a crucial step. The exact procedure will vary slightly based on the year and specific engine configuration of your Buick Lesabre.
* Professional Help: If you are not comfortable performing this repair yourself, it's best to take it to a qualified mechanic. Improper repair can lead to serious engine damage.
* Gaskets and Seals: Replace any damaged gaskets or seals. Using old, damaged seals can cause leaks.
* Torque Specifications: Use the correct torque specifications from your repair manual to avoid damaging the intake manifold or other components.
This is a simplified overview, and the actual procedure may be more complex. A detailed repair manual specific to your vehicle is crucial for success. Remember safety first! If you're uncertain about any step, seek professional help.
