The coolant is added to the expansion/overflow reservoir, not directly into the radiator.
In a 2007 Chevy Impala, the cooling system uses a pressurized expansion tank (the plastic reservoir) on the engine bay’s passenger side. Use Dex-Cool extended-life coolant, typically in a 50/50 premixed blend or a concentrate that’s mixed with distilled water. Always let the engine cool before opening any cap, and keep the coolant level between the MIN and MAX marks on the reservoir.
Where to add coolant
Use these steps to safely top up the coolant in your Impala's expansion reservoir.
- Park on level ground and turn off the engine. Allow it to cool completely before touching the cooling system.
- Open the hood and locate the translucent expansion/overflow reservoir on the passenger side of the engine bay, near the radiator. The cap may say “Do Not Open Hot.”
- Slowly remove the reservoir cap only after the engine has cooled to relieve any residual pressure.
- Check the fluid level; if it’s below the MIN mark, add coolant until it reaches the MAX mark.
- Use the correct coolant type: Dex-Cool extended-life coolant. If you buy concentrate, mix it 50/50 with distilled water (not tap water). If you purchase pre-mixed 50/50, you can use it as is.
- Reinstall the cap securely, start the engine, and let it reach normal operating temperature. Recheck for leaks and, if necessary, recheck the level once the engine cools again.
After topping up, monitor the level over the next few days. If the level drops repeatedly, there may be a leak or another issue that requires inspection by a professional.
Choosing the right coolant
Using the correct coolant helps prevent corrosion and cooling-system problems. Here’s what to know for a 2007 Impala.
- Use Dex-Cool extended-life coolant, which is the standard in many GM vehicles of this era.
- If you buy concentrate, mix it with distilled water to a 50/50 ratio; if you buy premixed, you can use it directly.
- Avoid mixing Dex-Cool with green or universal coolants, which can cause incompatibility and sludge buildup.
- Always fill to the reservoir’s MAX line when the engine is cold; do not overfill.
- Store and handle coolant out of reach of children and pets, and dispose of any old coolant according to local regulations.
Properly identifying and using the right coolant helps protect the engine from overheating and damage, especially in climate extremes or high-mileage conditions.
Safety and quick tips
Keep these cautions in mind to avoid injury or damage while handling coolant.
- Avoid opening the reservoir cap when the engine is hot to prevent scalding and pressure release.
- Inspect hoses and the reservoir for cracks, leaks, or swelling; replace damaged components promptly.
- If you notice coolant odor, green or orange puddles, or radiator steam, stop driving and seek professional service.
In short, your coolant goes into the expansion reservoir on the passenger side of the engine bay. Use the Dex-Cool 50/50 blend (or premixed) and keep the level between MIN and MAX when the engine is cold. If you’re ever unsure or uncomfortable performing the task, a professional service visit is the safest option.
Summary
For a 2007 Chevy Impala, the coolant fill point is the expansion/overflow reservoir, not the radiator. Fill with Dex-Cool extended-life coolant (50/50 premixed or concentrate mixed with distilled water) and keep the level between the MIN and MAX marks when cold. Always work on a cooled engine, replace the cap securely, and monitor for leaks or overheating. When in doubt, consult the owner's manual or a trusted mechanic for guidance.