The coolant you need for a 2017 Chevy Sonic is Dex-Cool, General Motors’ orange long-life coolant. Use a 50/50 premixed solution or Dex-Cool concentrate diluted with distilled water according to the label.
For the 2017 Sonic, GM specifies Dex-Cool (orange) as the coolant type. It’s an organic acid technology (OAT) formulation designed for longer service life, typically mixed 50/50 with distilled water. Avoid mixing Dex-Cool with green or silicate-based coolants, and always follow the bottle’s instructions or the owner's manual to ensure the correct ratio and compatibility.
Understanding the coolant you should use
Below are the Dex-Cool-compatible options that are appropriate for the Sonic. Choosing the right format helps ensure the cooling system seals and hoses stay in good condition and that the engine maintains proper operating temperature.
- Dex-Cool orange long-life coolant, GM-approved (a genuine Dex-Cool product).
- 50/50 premixed Dex-Cool coolant (ready to pour, no dilution needed).
- Dex-Cool concentrate that you mix with distilled water to achieve a 50/50 ratio, per the product label.
- GM-approved universal coolant that explicitly states Dex-Cool compatibility or GM Dex-Cool approval on the label.
Note: Always verify that the product specifically states Dex-Cool compatibility or GM Dex-Cool approval. Using a coolant not approved for GM Dex-Cool can cause corrosion, gelling, or gasket failure over time.
Maintenance tips and how to change coolant in a Sonic
If you’re planning a coolant change or top-up, follow these guidelines to stay within GM specifications and avoid mixed-coolant problems.
- Park on level ground and let the engine cool completely before opening the cooling system cap to avoid burns from hot coolant.
- Drain the old coolant from the radiator and reservoir. If you’re switching from one coolant type to another, consider a full flush to remove residues.
- Fill with Dex-Cool in the correct format—premixed 50/50 or concentrate diluted to 50/50 with distilled water—according to the product label and your manual.
- Start the engine and run it to operating temperature with the radiator cap off briefly to bleed air, then top up to the proper level once the system settles.
Most Dex-Cool formulations are designed to last about 5 years or 150,000 miles, whichever comes first, but always follow your owner's manual's maintenance schedule. If you notice overheating, milky-looking fluid, or a consistent drop in coolant level, have the system inspected for leaks or hose issues.
Can I use any universal coolant in a 2017 Sonic?
It’s best to use a coolant that explicitly states Dex-Cool compatibility or GM Dex-Cool approval. Some universal coolants claim Dex-Cool compatibility, but not all do. If you choose a universal product, read the label carefully to confirm it is Dex-Cool compatible and designed for GM vehicles. When in doubt, stick with genuine Dex-Cool or a GM-approved Dex-Cool formulation.
What to check before refilling
Before you refill, verify the model’s requirements and inspect for any leaks or contaminated coolant. The Sonic’s cooling system is sealed and relies on the correct orange Dex-Cool formulation to prevent corrosion and ensure proper heat transfer. Always use distilled water to dilute concentrates and avoid tap water, which can introduce minerals and affect performance.
Summary
In short, use Dex-Cool orange long-life coolant that meets GM specifications for your 2017 Chevy Sonic. The simplest option is a 50/50 premixed Dex-Cool, but Dex-Cool concentrate is acceptable if diluted correctly. Do not mix Dex-Cool with non-Dex-Cool coolants unless the label clearly confirms compatibility. Adhere to the owner’s manual for intervals and replacement guidance, and seek professional service if you notice overheating or coolant leaks.