2015 GMC Acadia Coolant Capacity & Type

The 2015 GMC Acadia's cooling system holds approximately 11.0 to 11.3 quarts (10.4 to 10.7 liters) of coolant, depending on the engine. This amount includes the radiator, engine passages, and overflow reservoir.

Quick Answer

• Total Cooling System Capacity: 11.0 - 11.3 quarts (10.4 - 10.7 liters)
• OEM Coolant Spec: DEX-COOL (Orange/Red, OAT formula, GM Dex-Cool specification)
• Mix Ratio: 50/50 prediluted or 50/50 mix of concentrate with distilled water

Capacity by Engine Option

All 2015 GMC Acadia models came equipped with the 3.6L V6 engine (LLT or LFX). The capacities are very similar, with minor variations based on specific vehicle options.

Flush Interval

Coolant flush intervals are crucial for maintaining the health of your cooling system. General Motors recommends the following for your 2015 GMC Acadia using DEX-COOL coolant:

• Normal Duty: Every 5 years or 150,000 miles, whichever comes first.
• Severe Duty: If your driving conditions regularly include towing, driving in dusty conditions, or extensive idling, it is advisable to inspect your coolant more frequently and consider flushing every 3 years or 45,000 miles.

Always refer to your owner's manual for the most accurate and up-to-date maintenance schedules.

How to Refill & Bleed

Properly refilling and bleeding the cooling system is essential to prevent air pockets, which can lead to overheating. Here's a general procedure for your 2015 GMC Acadia:

1. Safety First: Ensure the engine is completely cool before starting. Wear appropriate personal protective equipment, including gloves and eye protection.
2. Drain System: Locate the radiator drain petcock (usually at the bottom of the radiator on one side) and open it to drain the old coolant into a suitable container. You may also need to disconnect the lower radiator hose for a more complete drain. Remember to properly dispose of used coolant.
3. Flush (Optional but Recommended): If performing a full flush, close the drain petcock and fill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature, then drain. Repeat this process until the water runs clear. For a thorough flush, consider using a cooling system cleaner according to its directions.
4. Refill: Close the drain petcock and/or reattach the lower radiator hose. Slowly fill the coolant reservoir with the specified DEX-COOL 50/50 mix. Fill until the coolant level is between the "COLD FILL" marks.
5. Bleeding Air:
   • Start the engine and let it run with the heater on high (fan speed low). Ensure the reservoir cap is off.
   • As the engine warms up, you will see air bubbles escape from the reservoir. The coolant level will likely drop. Continue to top off the reservoir with coolant.
   • Some 2015 Acadia models may have a dedicated bleeder screw on one of the engine