2024 Chevrolet Suburban — Coolant Capacity & Type

The 2024 Chevrolet Suburban holds between 16.0 and 18.2 quarts (15.1 to 17.2 liters) of coolant, depending on the exact engine and heater configuration of your SUV. As an ASE-certified master technician, I regularly service these full-size family haulers, and proper cooling system maintenance is essential to keeping those V8 and Duramax engines running smoothly.

Here is your comprehensive guide to the coolant capacity, factory specifications, and maintenance procedures for the 2024 Chevrolet Suburban.

Quick answer

• Total cooling system capacity: 16.0 – 18.2 quarts (15.1 – 17.2 liters) depending on the engine.
• OEM coolant spec: DEX-COOL® (Orange/Pink). This is an OAT (Organic Acid Technology) coolant meeting GM specification GMW3420.
• Mix ratio: 50/50 mixture of DEX-COOL and clean, drinkable water (or distilled water). Pre-mixed 50/50 is highly recommended for convenience. In extremely cold climates (below -34°F / -37°C), a 60/40 coolant-to-water ratio may be used.

Capacity by engine option

The 2024 Suburban is available with three different powertrains. Because it features a massive cabin with front and rear climate control zones, the cooling system is larger than a standard pickup truck.

*Note: The 3.0L Duramax also features a secondary cooling circuit for the charge air cooler (CAC) which has its own separate capacity (approx. 3.5 quarts). Always consult your owner's manual for your exact trim and tow package specs.

Flush interval

GM utilizes long-life DEX-COOL in the modern Suburban, meaning you won't be flushing it as often as older vehicles. However, do not ignore these intervals:

• Normal Duty: Replace the coolant every 150,000 miles or 5 years, whichever comes first.
• Severe Duty: If you frequently tow heavy trailers, idle for extended periods, or drive in extreme heat/dusty conditions, it is highly recommended to inspect the coolant strength and level every 15,000 miles and consider flushing it closer to the 100,000-mile or 4-year mark to prevent acidic buildup.

How to refill & bleed

The 2024 Suburban uses a pressurized surge tank. Bleeding these large systems can be tricky due to the front and rear heater cores.

1. Preparation: Ensure the engine is completely cold. Place a drain pan under the radiator drain petcock.
2. Drain: Remove the surge tank cap, open the petcock, and let the old coolant drain. (To do a full flush, you may need to drain the block and rear heater lines, which is best left to a professional).
3. Vacuum Fill (Highly Recommended): Modern GM trucks and SUVs are notoriously difficult to bleed manually. Using a vacuum coolant refill tool (Airlift) attached to the surge tank is the factory-recommended procedure. It pulls a vacuum on the entire system and sucks the new 50/50 mix in, completely eliminating air pockets.
4. Manual Bleed (If necessary): If you must fill manually, slowly pour the 50/50 DEX-COOL mix into the surge tank until it reaches the "COLD FILL" line. Leave the cap off.
5. Run the Engine: Start the engine and turn the front and rear climate controls to maximum heat with low fan speed. Let it idle until the thermostat opens (the upper radiator hose will get hot).
6. Top Off: As air bubbles out of the surge tank, the fluid level will drop. Add coolant to maintain the cold fill mark. Once the level is stable, secure the cap and test drive. Check the level again the next morning when cold.

Common cooling system issues

For the current generation of the Chevrolet Suburban (2021-Present), keep an eye out for these cooling system quirks:

• Thermostat Failures (V8 Models): The 5.3L and 6.2L engines can occasionally suffer from thermostat sticking. If the gauge reads slightly hotter than normal or your cooling fans run on high constantly, the thermostat is the prime suspect.
• Water Pump Weeping: While much improved over older generations, the mechanical water pumps on the V8s can begin to weep from the weep hole as the internal seal wears out, usually past the 75,000-mile mark.
• Rear Heater Line Corrosion: If you live in the rust belt, pay attention to the long aluminum coolant lines running to the rear heater core. They are exposed under the vehicle and can corrode over time, leading to slow coolant leaks.

If you are dealing with a stubborn leak or need a professional coolant flush using vacuum equipment, don't leave it to chance. Find a trusted shop on Repairius.