2022 GMC Acadia Coolant Capacity & Type Guide

The 2022 GMC Acadia holds between 9.2 quarts (8.7 liters) and 12.1 quarts (11.5 liters) of engine coolant, depending on which engine option is sitting under the hood. As an ASE-certified master technician, I frequently service these midsize SUVs and always stress the importance of using the correct fluids and bleeding procedures to keep them running at optimal temperatures. Below is your comprehensive guide to the 2022 Acadia's cooling system.

Quick answer

When it comes to servicing the cooling system on your 2022 Acadia, here are the critical specifications you need to know before you begin:

• Total Cooling System Capacity: 9.2 quarts (8.7 L) to 12.1 quarts (11.5 L), depending on the engine.
• OEM Coolant Specification: GM DEX-COOL® (Orange/Pink). This is an OAT (Organic Acid Technology) coolant meeting the GM GMW3420 standard.
• Mix Ratio: A 50/50 mixture of concentrated DEX-COOL and clean, drinkable (or distilled) water. You can also purchase 50/50 pre-mixed DEX-COOL to save time.

Capacity by engine option

The 2022 GMC Acadia was offered with two main engine choices, each requiring a different volume of coolant. If your vehicle has the optional rear heating system, the total capacity will fall on the higher side of these estimates due to the extra heater hoses and rear heater core.

Note: Capacities are approximate. Always verify fluid levels via the surge tank markings after running the engine to operating temperature.

Flush interval

Coolant degrades over time, losing its anti-corrosion properties and freezing protection.

• Normal Duty: GM recommends draining, flushing, and refilling the cooling system every 150,000 miles or 5 years, whichever comes first.
• Severe Duty: If you frequently use your Acadia for towing, idle for long periods, or drive in extreme high-temperature environments, you should service the cooling system every 50,000 miles or 3 years.

How to refill & bleed

Modern cooling systems can easily trap air pockets, which lead to localized overheating and erratic heater performance. Follow these steps to refill and bleed your 2022 Acadia safely:

1. Prep: Ensure the engine is completely cool before removing the pressurized surge tank cap.
2. Vacuum Fill (Recommended): Because the 2.0L Turbo and 3.6L V6 route coolant through complex passages, using a pneumatic vacuum coolant refill tool is highly recommended. This pulls a vacuum on the empty system and draws the new 50/50 DEX-COOL in without introducing air.
3. Manual Refill (Alternative): If you don't have a vacuum filler, slowly pour coolant into the surge tank until it reaches the cold fill line.
4. Bleed: Leave the cap off. Start the engine and turn the climate control heater to the highest setting with low fan speed. Let the engine idle until the thermostat opens (you will feel the upper radiator hose get hot).
5. Top Off: As the system burps out trapped air, the fluid level in the tank will drop. Add coolant to maintain the level at the cold fill line. Once the level stabilizes, install the cap tightly.
6. Test Drive: Drive the vehicle, monitor the temperature gauge, and check the surge tank level again after the engine has cooled down completely.

Common cooling system issues

The current generation GMC Acadia is generally reliable, but there are a few cooling system quirks to watch out for as the mileage increases:

• Thermostat Housing Leaks: On the 3.6L V6, the thermostat housing and water outlet gasket can degrade over time, leading to slow, weeping coolant leaks. If you smell sweet maple syrup under the hood but don't see drips on the ground, check this area.
• Water Pump Failure: While improved over older GM V6 engines, the water pump bearings can still wear out prematurely, leading to a noisy pump and seal failure.
• Heater Core Clogs: Neglecting the 5-year coolant flush interval allows DEX-COOL to break down and form a sludgy gel. This typically clogs the fine passages of the heater core, resulting in no heat in the cabin on cold mornings.

Routine maintenance is the best way to avoid these headaches. If you aren't comfortable performing a vacuum coolant bleed or replacing a weeping water pump yourself, don't risk overheating your engine.

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