2015 Chevrolet Silverado 1500 Coolant Capacity & Type

The 2015 Chevrolet Silverado 1500 holds approximately 16.6 quarts (15.7 liters) of coolant for the 4.3L LV3 V6 engine, 16.7 quarts (15.8 liters) for the 5.3L L83 V8 engine, and 17.8 quarts (16.9 liters) for the 6.2L LT1 V8 engine.

Quick Answer

• Total Cooling System Capacity: 16.6 - 17.8 quarts (15.7 - 16.9 liters) depending on engine.
• OEM Coolant Spec: DEX-COOL (Orange/Reddish-Orange, OAT - Organic Acid Technology).
• Mix Ratio: 50/50 Pre-mix or Concentrate mixed to 50/50 with distilled water.

Capacity by Engine Option

Flush Interval

For the 2015 Chevrolet Silverado 1500, GM recommends the following coolant flush intervals:

• Normal Duty: Typically 5 years or 150,000 miles, whichever comes first.
• Severe Duty: If your driving habits include frequent towing, heavy loads, or extreme temperatures, it's advisable to inspect your coolant more frequently and consider a flush every 2-3 years or 50,000-75,000 miles.

How to Refill & Bleed

Properly refilling and bleeding the cooling system on your 2015 Silverado is crucial to prevent air pockets that can lead to overheating. Always perform this on a cool engine.

1. Drain the System: With the engine cool, place a drain pan under the radiator. Open the radiator drain cock (petcock) and remove the radiator cap to allow the system to drain completely. For a full flush, you may also need to drain the engine block. Consult your service manual for specific locations.
2. Close Drain and Refill: Close the radiator drain cock. Slowly add the proper DEX-COOL 50/50 coolant mixture to the radiator until full. Fill the coolant reservoir to the "COLD FILL" line.
3. Bleed the System: This is critical. Start the engine with the radiator cap off (or loosely installed) and the heater on full blast (hot). This helps open the heater core valve and allows coolant to circulate through the entire system. As the engine warms up, the thermostat will open, and you'll see the coolant level in the radiator drop. Continue to top off the radiator with coolant. Watch for air bubbles to escape. You may need to gently squeeze the upper and lower radiator hoses to help dislodge air pockets.
4. Special Note: The 2015 Silverado 1500 typically does not have specific bleed screws that need to be opened manually. The self-bleeding design relies on circulating coolant through the system. Pay close attention to the coolant level in the reservoir over the next few drive cycles and top off as needed.
5. Final Check: Once the engine reaches operating temperature and no more air bubbles appear, install the radiator cap. Let the vehicle cool down completely, then recheck the coolant level in the reservoir and top off if necessary.

Common Cooling System Issues for This Generation

While the 2015 Chevrolet Silverado 1500 typically has a robust cooling system, some common issues can arise:

• Water Pump Leaks: The water pump is a common failure point across many vehicles. Look for coolant leaks near the front of the engine, particularly around the pump pulley. A grinding noise from the front of the engine could also indicate a failing water pump bearing.
• Radiator Leaks: Over time, plastic end tanks on the radiator can become brittle and crack, leading to coolant leaks. Small leaks might also occur from corroded radiator fins.
• Thermostat Failure: A stuck-open thermostat will cause the engine to run cooler than normal, reducing heater output and fuel efficiency. A stuck-closed thermostat is more serious, leading to rapid overheating. Symptoms include erratic temperature gauge readings or no heat from the vents.
• Heater Core Issues: While less common, a clogged or leaking heater core can result in a lack of heat inside the cabin, a sweet smell of coolant, or fogging of the windows.
• Hose Leaks: Rubber hoses can degrade over time due to heat and pressure, leading to cracks, bulges, or leaks at connection points. Periodically inspect all coolant hoses for signs of wear.

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