Here's a general outline. The specifics might vary slightly depending on *which* heater hose fitting you're replacing (there are several). Consult a repair manual specific to your 2002 Impala for detailed diagrams and torque specifications. A Haynes or Chilton manual would be invaluable.
Tools You'll Likely Need:
* Wrench(es): Probably a combination of metric wrenches (sizes will depend on the fitting; check your manual). You might need open-end, box-end, or even a flare-nut wrench for stubborn fittings.
* Pliers: Channel-lock pliers might be useful for gripping hoses or stubborn clamps.
* Screwdrivers: Possibly Phillips and/or flathead, depending on the type of clamps securing the hoses.
* Drain pan: To catch the coolant.
* Funnel: To refill the cooling system.
* New hose fitting: Make sure you get the correct replacement part. Take the old fitting to an auto parts store for matching.
* New hose clamps: It's best to replace these while you're at it. Worm-gear clamps are recommended.
* Coolant: Use the correct type of coolant for your Impala's cooling system (check your owner's manual).
* Shop rags or paper towels: For cleanup.
Procedure (General Steps):
1. Locate the fitting: Identify the specific heater hose fitting you need to replace. Consult your repair manual for its location.
2. Drain coolant: Locate the drain plug on the engine block or radiator (consult your manual). Place the drain pan underneath and carefully open the drain plug to let the coolant drain completely.
3. Disconnect the hoses: Carefully loosen and remove the hose clamps securing the hose(s) to the fitting. Sometimes, the hoses themselves might need to be cut to remove them. Be prepared for some coolant spillage.
4. Remove the old fitting: Use the appropriate wrench(es) to carefully remove the old fitting. Be prepared for it to be tight; use penetrating oil (like PB Blaster) if needed and allow time for it to work. Work gently to avoid damaging the surrounding components.
5. Install the new fitting: Carefully install the new fitting, ensuring it's seated correctly. Tighten it to the manufacturer's specified torque (find this in your repair manual). Do not overtighten.
6. Reconnect the hoses: Attach the hoses to the new fitting, securing them with new hose clamps. Make sure the clamps are tightened securely but not excessively.
7. Refill the cooling system: Carefully refill the cooling system with the correct type of coolant, adding coolant to the radiator until it's full. Then, start the engine and let it run until it reaches operating temperature. Check for leaks.
8. Burp the system: Most cooling systems require "burping" to remove air pockets. This is usually done by opening the radiator cap (carefully, as it will be pressurized) and squeezing hoses to release air bubbles. Check your owner's manual for the specific procedure.
9. Check coolant level: After the engine has cooled, check the coolant level and add more if needed.
Important Considerations:
* Repair Manual: A repair manual is highly recommended. It will give you detailed diagrams and instructions specific to your vehicle.
* Professional Help: If you're uncomfortable performing this repair, it's best to take your vehicle to a qualified mechanic. Improper repair could lead to further damage or even injury.
* Corrosion: If the fitting was corroded, you might find it easier to cut the old hose close to the fitting and use a new length of hose to attach the new fitting, rather than trying to wrestle the old fitting free.
This is a general guide. Always refer to your vehicle's repair manual for detailed instructions and torque specifications before beginning this repair. Safety is paramount.
