Here's a general procedure. Specific locations might vary slightly depending on the exact engine (3.4L or 3.8L V6) but the overall process is similar:
Tools You'll Need:
* Basin or container: To catch the coolant.
* Wrench: The size will depend on the hose clamp; often a slip-joint pliers or a small adjustable wrench will suffice. You might need a different wrench size depending on the type of clamp. Some use a screw type clamp, others a crimp type that you squeeze to loosen.
* Flathead screwdriver (possibly): To help pry the hose loose if it's stuck, use carefully to avoid damaging the hose or radiator.
* Gloves: To protect your hands from coolant.
* Shop rags or paper towels: To clean up spills.
Steps:
1. Cool the Engine: Let the engine cool completely before proceeding. Hot coolant will cause severe burns.
2. Position Yourself: Gain access to the lower radiator hose. This usually involves working from underneath the vehicle. You may need to raise the front of the car with a jack and secure it with jack stands for better access and safety.
3. Locate the Hose Clamps: There will be one or two clamps securing the lower radiator hose to the radiator and engine block. Identify their type – screw type or crimp type.
4. Loosen the Clamps: Use your wrench to loosen the clamps. For screw-type clamps, simply turn the screw counter-clockwise. For crimp-type clamps, squeeze the clamp using the pliers to loosen the grip on the hose. You'll likely need to rotate the clamp as you loosen it.
5. Remove the Hose: Gently wiggle the hose free from the radiator and engine block. It may be slightly stubborn due to the seal formed by the coolant and the hose. A gentle twisting motion might help. If necessary, use a flathead screwdriver *very carefully* as a pry tool to help break the seal, but be extremely cautious to avoid damaging the hose or radiator.
6. Catch the Coolant: As you remove the hose, coolant will spill out. Have your basin or container ready to catch it.
7. Inspect the Hose and Clamps: Check the condition of the hose for cracks or deterioration. Also, inspect the clamps; if they're damaged or rusty, replace them.
Important Considerations:
* Coolant is toxic: Avoid skin contact and inhalation. If you get coolant on your skin, wash thoroughly with water.
* Proper disposal: Dispose of the coolant properly according to your local regulations. Auto parts stores often accept used coolant for recycling.
* Reassembly: When reinstalling the hose, ensure it's properly seated and the clamps are tightened securely, but not over-tightened.
This is a general guide. If you are uncomfortable working on your vehicle, it is best to take it to a qualified mechanic. Improperly working on your vehicle can lead to damage and injury. Consult a repair manual specific to your 2003 Chevy Impala for detailed diagrams and instructions.
