2024 GMC Yukon Coolant Capacity & Type Guide

The 2024 GMC Yukon holds between 16.1 and 22.8 quarts of engine coolant, depending on the specific engine and climate control options your SUV is equipped with. As an ASE-certified master technician, I frequently service GM’s lineup of full-size SUVs, and getting the coolant specification and bleeding procedure right is critical to keeping these large haulers running at optimal temperatures. Below is your comprehensive guide to the 2024 GMC Yukon's cooling system.

Quick Answer

If you are topping off or performing a complete flush, here is the essential information you need for the 2024 GMC Yukon:

• Total cooling system capacity: 16.1 to 22.8 quarts (15.2 to 21.6 liters), heavily dependent on the engine and rear heating packages.
• OEM coolant spec: ACDelco Dex-Cool. This is an Orange, OAT (Organic Acid Technology) coolant meeting the GMW3420 (formerly GM6277M) specification.
• Mix ratio: 50/50 mix of Dex-Cool concentrate and clean, drinkable water (preferably distilled), or a 50/50 pre-mixed solution. In extreme cold environments (below -34°F / -37°C), a 60/40 coolant-to-water ratio may be used, but never exceed 70% coolant.

Capacity by Engine Option

Because the Yukon is available with two different V8s and a turbodiesel inline-six, capacities vary significantly. Models with rear climate control systems (standard on most passenger Yukons) have longer coolant lines and heater cores, increasing the total capacity.

Note: Capacities are approximate dry-fill volumes. When performing a drain and fill, you will likely use slightly less due to residual coolant trapped in the engine block and heater core.

Flush Interval

To protect the internal components, water pump, and heater core from corrosion and scaling, adhering to the proper flush interval is mandatory.

• Normal Duty: Replace the engine coolant every 5 years or 150,000 miles, whichever comes first.
• Severe Duty: If you frequently tow heavy loads, idle extensively (such as fleet or livery use), or drive in dusty/extreme environments, consider dropping the interval to 4 years or 100,000 miles. Always inspect the coolant level and condition at every oil change.

How to Refill & Bleed

Modern GM trucks and SUVs utilize a pressurized surge tank. Bleeding the air out of these systems can be notoriously tricky, especially on the 3.0L Duramax and vehicles with auxiliary rear heaters.

1. Use a Vacuum Fill Tool: For the 2024 Yukon, using a vacuum coolant filler is highly recommended. This tool pulls a deep vacuum on the cooling system, checking for leaks before drawing the fresh coolant in, virtually eliminating trapped air pockets.
2. Manual Fill (If vacuum tool is unavailable): Slowly pour the 50/50 Dex-Cool mixture into the surge tank until it reaches the "COLD FILL" line.
3. Bleed the System: Start the engine and turn the front and rear climate controls to their maximum heat settings with the fan on low. This opens the valves to the heater cores.
4. Warm Up: Let the engine idle until it reaches normal operating temperature and the thermostat opens (the upper radiator hose will become hot).
5. Top Off: Cycle the engine RPM between idle and 2,500 RPM a few times to push out stubborn air bubbles. Shut the engine off, let it cool completely, and top off the surge tank to the proper mark.

Common Cooling System Issues

While the 2024 Yukon is a relatively new generation (T1XX platform), we can expect it to share some of the common cooling quirks seen in recent GM full-size SUVs:

• Water Pump Weepage: The mechanical water pumps on the 5.3L and 6.2L V8s have a weep hole that may slowly seep coolant as the internal seal wears out. Keep an eye on this around the 70,000 to 100,000-mile mark.
• Radiator End Tank Leaks: The crimped plastic end tanks on the aluminum radiators can develop hairline cracks or seal failures after years of thermal cycling.
• 3.0L Duramax Thermal Management: The diesel engine utilizes a complex Coolant Control Valve (CCV) rather than a traditional thermostat to route coolant. If this valve fails, it can trigger check engine lights or cause the engine to run too hot/cold.

Keep your Yukon's cooling system in top shape, and it will reward you with hundreds of thousands of miles of reliable hauling. If you need professional assistance with a coolant flush, leak diagnosis, or water pump replacement, find a trusted shop on Repairius.