The 2011 Chevy Impala requires Dex-Cool extended-life engine coolant (the orange GM Dex-Cool). It is typically available in 50/50 pre-mixed form or as a concentrate you mix with distilled water.
Coolant type and specifications
Dex-Cool is GM’s long-life, silicate-free coolant designed for aluminum engines. The Impala’s cooling system is intended to use Dex-Cool or a GM-approved equivalent that meets Dex-Cool specifications. When filling, choose a product labeled Dex-Cool or compatible with GM Dex-Cool, and avoid mixing with conventional green coolant.
Here are the practical options you’ll encounter when buying replacements or topping up the system.
- Dex-Cool Extended-Life Coolant (orange), GM Dex-Cool; available as pre-mixed 50/50 or as concentrate to mix with distilled water per the label.
- Pre-mixed 50/50 Dex-Cool coolant, ready to pour without additional mixing.
- If using Dex-Cool concentrate, mix 1 part concentrate with 1 part distilled water to achieve a 50/50 blend.
- Do not mix Dex-Cool with conventional green or HOAT (Hybrid Organic Acid Technology) coolants; mixing can cause gelling and reduced protection.
- Always verify the product is labeled for GM Dex-Cool compatibility and follow the container instructions.
In practice, the recommended approach is to use Dex-Cool in a 50/50 mix, using either the pre-mixed option or concentrate with distilled water, and to avoid mixing with non-Dex-Cool products.
Maintenance and care
If you plan to service the cooling system, follow these general steps to help ensure proper Dex-Cool performance and avoid contamination.
- Ensure the engine is completely cool before opening the cooling system to prevent scalding or pressurized spray.
- Drain the old coolant from the radiator and engine block using the appropriate drain(s) and dispose of it at an approved recycling facility.
- If switching from a non-Dex-Cool formulation, flush the system with distilled water to remove residual coolant types and contaminants.
- Refill with Dex-Cool (or Dex-Cool 50/50 premixed) according to the label, typically in a 50/50 ratio with distilled water.
- Bleed the cooling system as required by the vehicle’s service manual to remove air pockets, then start the engine and check for leaks and proper temperature operation.
- Check the reservoir level after the engine reaches operating temperature and add more Dex-Cool if needed; recheck after a short drive.
- Recycle or dispose of used coolant according to local regulations; never pour it down the drain or on the ground.
Following these steps helps ensure Dex-Cool performs as intended and protects the engine from overheating or contamination. When in doubt, consult the owner’s manual or a qualified technician at a GM dealership.
Regional considerations
Regions with extreme temperatures or specific driving conditions may have particular maintenance intervals. Always verify with the vehicle’s manual or a GM-certified technician for region-specific guidance and disposal regulations for used coolant.
Summary
The 2011 Chevy Impala uses Dex-Cool extended-life coolant (orange). Use Dex-Cool or GM-approved equivalents, preferably in a 50/50 mix (pre-mixed or concentrate with distilled water). Do not mix Dex-Cool with green or HOAT formulations, and follow the manual for service intervals and proper disposal. When in doubt, consult a dealership or qualified mechanic.