Chevrolet Coolant Capacity Chart: Dex-Cool Specifications Explained
You pop the hood, see the coolant reservoir is low, and realize you have no idea how much orange coolant your Chevy actually needs—but this guide walks you through Dex-Cool specs and exactly what to add.
Let’s be honest—coolant isn’t the most exciting part of owning a Chevy, but getting it wrong can lead to some pretty expensive problems. Use the wrong stuff, mix colors, or overfill, and you could be looking at corrosion, overheating, or worse.
Here’s what you need to know about Chevrolet’s orange coolant, Dex-Cool, and how much your specific model takes.
TL;DR
Dex-Cool is General Motors’ orange, extended-life coolant (GM 6277M specification) . It’s designed to last five years or 150,000 miles . Never mix it with traditional green coolant—that can cause sludge and cooling system damage. Capacities vary widely by model: a 2009 Avalanche 5.3L holds 18.3 quarts, while a 1999 Venture with rear A/C holds 12.1 quarts . Always check your owner’s manual for the exact capacity for your specific vehicle.
Key Takeaways
- Orange only: Dex-Cool is orange—don’t confuse it with blue or green coolants
- Long life: 5 years or 150,000 miles between flushes (whichever comes first)
- Never mix: Mixing Dex-Cool with conventional green coolant causes sludge and can clog your cooling system
- Dilution matters: Most Dex-Cool is sold as a 50/50 prediluted mix, but concentrate is available too
- Rear heat adds capacity: Vehicles with rear heating usually need about 2 extra quarts
What Is Dex-Cool, Really?
Dex-Cool is GM’s extended-life coolant. It uses organic acid technology (OAT) in an ethylene glycol base to protect all cooling system metals, including aluminum . Unlike traditional green coolant, it’s phosphate, silicate, borate, amine, and nitrite-free .
The GM-approved suppliers include Prestone, Chevron, Texaco, Shell, Valvoline, and BASF . Look for the orange color—that’s how you know it’s Dex-Cool .
Never add conventional green coolant to a system designed for Dex-Cool. GM warns that using other coolants can cause premature engine, heater core, or radiator corrosion. If you do, you’ll need to change it every 10,000 miles or 12 months instead of the usual 150,000 miles.
Chevrolet Coolant Capacity Charts by Model
Here are specific capacities from GM service information. All capacities are approximate—always check your owner’s manual.
2009 Avalanche
| Engine | Capacity (Quarts) | Capacity (Liters) |
|---|---|---|
| 4.8L V8 | 17.8 qt | 16.9 L |
| 5.3L V8 | 18.3 qt | 17.3 L |
| 6.0L V8 (1500 Series) | 17.9 qt | 16.9 L |
| 6.0L V8 (2500 Series) | 18.1 qt | 16.5 L |
| 6.2L V8 | 17.6 qt | 17.1 L |
2006 Suburban
| Engine | Capacity (Quarts) | Capacity (Liters) |
|---|---|---|
| 4.8L V8 | 16.8 qt | 15.9 L |
| 5.3L V8 | 16.8 qt | 15.9 L |
| 6.0L V8 | 16.2–16.6 qt | 15.3–15.7 L |
| 8.1L V8 | 25.0 qt | 23.7 L |
If your Suburban is equipped with rear heating, add approximately 2.1 quarts (2.0 liters) to the above capacities.
1999 Venture
| Setup | Capacity (Quarts) | Capacity (Liters) |
|---|---|---|
| Front HVAC only (without heavy duty cooling) | 9.5 qt | 9.1 L |
| Front and rear HVAC (without heavy duty cooling) | 12.1 qt | 11.6 L |
| Front HVAC only (with heavy duty cooling) | 10.5 qt | 10.1 L |
| Front and rear HVAC (with heavy duty cooling) | 13.2 qt | 12.6 L |
2005 Kodiak C-Series (Heavy Duty)
These commercial trucks have massive cooling systems:
| Configuration | Capacity (Quarts) | Capacity (Liters) |
|---|---|---|
| 6.6L with auto trans | 27.3 qt | 25.8 L |
| 8.1L with auto trans | 29.8 qt | 28.2 L |
| 8.1L with manual trans | 30.1 qt | 28.5 L |
| 7.8L Duramax (highest) | 35.4 qt | 33.5 L |
Common Questions About Dex-Cool
Can I use Prestone Dex-Cool in my Chevy?
Yes—Prestone is a GM-approved supplier of Dex-Cool under the GM 6277M specification . The 50/50 prediluted version provides freeze and corrosion protection and is ready to use .
How long does Dex-Cool last?
Five years or 150,000 miles (whichever comes first) for most vehicles . Some brands advertise up to 10 years with a complete flush and fill, but GM’s official spec is 5 years/150,000 miles .
Can I add water to Dex-Cool?
Only if you’re using concentrated Dex-Cool and mixing to a proper ratio (typically 50/50). If you’re using premixed 50/50, it’s already diluted and ready to go . GM recommends a 56% coolant to 44% water mix for some models .
References
Chevrolet Dex-Cool Coolant Capacities and Specifications – Official Sources:
- GM Service Information – 2009 Avalanche Capacities
- GM Service Information – 2006 Suburban Capacities
- GM Service Information – 1999 Venture Capacities
- GM Service Information – 2005 Kodiak Capacities
- GM Bulletin 06-06-02-011 – Dex-Cool Introduction
- Valvoline – Dex-Cool Specifications
What Chevy are you driving, and how often do you check your coolant level? Drop a comment below.
