Tools and Materials:
* Drain pan: Large enough to hold several gallons of coolant.
* Wrench: The size needed to remove the radiator drain petcock (usually a 1/2" or 7/16" wrench) and possibly the lower radiator hose clamp.
* Funnel: To pour in the flushing solution and new coolant.
* Garden hose: For connecting to the radiator's flush port (if equipped) or for rinsing.
* Radiator flush solution: Available at most auto parts stores. Follow the instructions on the product you choose.
* New coolant (antifreeze/coolant mixture): Refer to your owner's manual for the correct type and mixture ratio (usually a 50/50 mix of coolant and distilled water).
* Protective gloves and eyewear: Coolant is corrosive.
Procedure:
1. Safety First: Let the engine cool completely before starting this process. Hot coolant can cause severe burns.
2. Drain the Coolant:
* Locate the radiator drain petcock (usually at the bottom of the radiator).
* Place your drain pan underneath.
* Carefully open the petcock to drain the coolant.
* Once drained, close the petcock.
3. Remove the Lower Radiator Hose (Optional but recommended):
* This allows for better flushing. If you do this, be prepared for more coolant spillage.
* Loosen the hose clamp and carefully remove the lower radiator hose from the radiator.
4. Flush the Radiator:
* Method 1 (Using a flushing solution): Follow the instructions on your chosen radiator flush solution. Generally, you'll add the solution to the radiator, refill with water, run the engine for 15-20 minutes, then drain. Repeat as needed.
* Method 2 (Using a garden hose): If your radiator has a flush port (a fitting usually located on the top of the radiator), connect a garden hose to it and run water through the system. Let water flow until it runs clear. Otherwise, you can try to flush from the top by pouring water into the radiator and draining repeatedly. This method might be less effective than using a flushing solution.
5. Reinstall the Lower Radiator Hose (If removed): Carefully reattach the lower radiator hose and tighten the clamp securely.
6. Refill the Radiator: Using a funnel, add the correct mixture of coolant and distilled water to the radiator. Refer to your owner's manual for the proper coolant type and mixture.
7. Bleed the Air: Start the engine and let it run until the thermostat opens (check your temperature gauge). This will allow the coolant to circulate and remove air pockets from the system. You may need to add more coolant as air is expelled. Some Impalas have a bleed valve that needs to be opened to let air escape; check your owner's manual.
8. Check for Leaks: Inspect the hoses, clamps, and radiator for leaks.
9. Dispose of Coolant Properly: Coolant is harmful to the environment. Take it to a local auto parts store or recycling center for proper disposal.
Important Considerations:
* Owner's Manual: Always refer to your 2004 Chevy Impala's owner's manual for specific instructions and recommendations.
* Professional Help: If you are uncomfortable performing this task, it's best to take your vehicle to a qualified mechanic. Improper flushing can damage your engine.
* Coolant Type: Use the correct type of coolant specified in your owner's manual. Using the wrong type can damage your engine.
This is a general guide. The specifics may vary slightly depending on your Impala's exact configuration. Always prioritize safety and consult your vehicle's documentation before beginning any repair or maintenance procedure.
