2023 Chevrolet Silverado 1500 — Coolant Capacity & Type

The 2023 Chevrolet Silverado 1500 holds between 11.5 and 16.0 quarts (10.9 to 15.1 liters) of coolant, depending on the exact engine equipped in your truck. If you are doing a routine drain and fill, flushing the system, or simply topping off your surge tank, using the correct coolant type and knowing your truck's exact capacity is essential to keep your engine running at the optimal temperature.

Quick answer

• Total cooling system capacity: 11.5 – 16.0 quarts (10.9 – 15.1 liters)
• OEM coolant spec: Dex-Cool® (Orange in color). This is an Organic Acid Technology (OAT) antifreeze that meets General Motors specification GMW3420 (formerly GM 6277M).
• Mix ratio: 50/50 mixture of Dex-Cool concentrate and clean, drinkable water (or pre-mixed 50/50 Dex-Cool).

Capacity by engine option

The 2023 Silverado 1500 offers four main engine choices, and the cooling system capacity varies significantly based on which powerplant is under the hood. Note that vehicles equipped with heavy-duty towing packages (max trailering) may hold slightly more due to auxiliary cooling loops.

Note: Capacities are approximate total system volumes. A standard radiator drain and fill will typically require less coolant than the total capacity listed above.

Flush interval

To maintain the anti-corrosion properties of the OAT chemistry in Dex-Cool, you must adhere to proper maintenance intervals.

• Normal Duty: General Motors recommends draining, flushing, and refilling the cooling system every 150,000 miles or 5 years, whichever comes first.
• Severe Duty: If you frequently tow heavy loads, idle extensively (such as fleet or construction use), or drive in extreme heat or dusty conditions, it is highly recommended to inspect the coolant annually and perform a flush closer to the 50,000 to 75,000-mile mark.

How to refill & bleed

The modern Silverado utilizes a pressurized surge tank rather than a traditional radiator cap. Furthermore, engines like the 2.7L Turbo and 3.0L Duramax use complex thermal management modules that make bleeding air out of the system more difficult than older models.

1. Prep the vehicle: Ensure the engine is completely cold. Place a drain pan under the radiator petcock.
2. Drain the system: Open the surge tank cap to relieve pressure, then open the radiator drain valve to empty the old coolant.
3. Vacuum fill (Highly Recommended): For the 2023 Silverado, particularly the 2.7L and 3.0L, using a pneumatic vacuum coolant filler is the factory-recommended method. This tool pulls a deep vacuum on the cooling system and sucks the new 50/50 Dex-Cool mixture in, completely eliminating air pockets.
4. Manual Bleed (Alternative): If you don't have a vacuum tool, slowly fill the surge tank to the "COLD FILL" line. Leave the cap off. Start the engine and turn the cabin heater to the maximum temperature setting with low fan speed. Let the truck idle until it reaches operating temperature and the thermostat opens.
5. Top off: As the thermostat opens, the coolant level will drop. Add coolant to maintain the level at the "COLD FILL" mark. Once the level stabilizes and hot air blows from the cabin vents, install the cap tightly. Recheck the level after your first drive.

Common cooling system issues

While the 2023 generation of the Silverado 1500 is generally reliable, there are a few cooling system quirks to watch out for as the mileage climbs:

• Active Thermal Management (ATM) valve issues: The 2.7L I4 uses an advanced rotary valve to distribute coolant rather than a traditional thermostat. These valves can occasionally stick or fail electrically, throwing a check engine light and causing the truck to run hot or take too long to warm up.
• V8 water pump seepage: On the 5.3L and 6.2L V8s, the mechanical water pump weep hole can begin to slowly leak coolant over time. If you smell sweet antifreeze but don't see a puddle, inspect the underside of the water pump pulley.
• Radiator end-tank leaks: Due to chassis flex when off-roading or towing heavy loads, the crimped plastic end-tanks on the radiator can eventually develop hairline cracks and seep Dex-Cool.

If you are experiencing unexplained coolant loss, overheating, or need a professional flush using the correct vacuum-fill procedure, don't leave it to chance. Find a trusted shop on Repairius.