2022 GMC Yukon Coolant Capacity, Type & Flush Guide

The 2022 GMC Yukon holds between 16.9 and 19.0 quarts (16.0 to 18.0 liters) of coolant, depending on your specific engine option and whether the vehicle is equipped with a rear passenger heating system. Keeping your cooling system properly maintained is critical for modern engines, especially given the complex Active Thermal Management systems found on the latest generation of GM SUVs.

Quick Answer

• Total Cooling System Capacity: 16.9 to 19.0 quarts (16.0 – 18.0 liters), depending on engine, rear HVAC, and Max Trailering packages.
• OEM Coolant Spec: ACDelco Dex-Cool (Orange color). This is an OAT (Organic Acid Technology) coolant meeting the GM GMW3420 specification.
• Mix Ratio: 50/50 mixture of Dex-Cool concentrate and clean, drinkable water (distilled or deionized water is highly recommended to prevent mineral scale). Pre-mixed 50/50 Dex-Cool is also perfectly acceptable and convenient.

Capacity by Engine Option

The 2022 GMC Yukon is offered with three distinct engine choices. Keep in mind that vehicles equipped with the rear heating core (standard on most passenger trims) and the Max Trailering package will sit at the higher end of these capacity ranges due to the extra coolant lines and larger radiators.

Note: Always verify fluid levels via the surge tank cold-fill line after bleeding the system, as exact drain-and-fill amounts will vary based on how much old coolant remains in the block.

Flush Interval

GM's factory recommendation for Dex-Cool in the 2022 Yukon is to drain, flush, and refill the cooling system every 150,000 miles or 5 years, whichever comes first.

However, if your Yukon is subjected to severe duty—such as frequent heavy towing, extensive idling (like police or fleet use), or operating in extreme ambient temperatures—it is wise to inspect the coolant condition every 30,000 miles. If the normally bright orange coolant appears dark, cloudy, or muddy, the OAT corrosion inhibitors have likely degraded, and an early flush is necessary to protect your water pump and heater cores.

How to Refill & Bleed

Modern GM engines, particularly the 3.0L Duramax and the V8s with Active Thermal Management (ATM) valves, are notorious for trapping air in the cooling system.

1. Preparation: Ensure the engine is completely cold. Locate the pressurized surge tank (coolant reservoir).
2. Vacuum Fill (Highly Recommended): Because of the complex network of coolant lines, mechanical rotary valves, and dual heater cores (front and rear), traditional "burping" is largely ineffective. You must use a vacuum coolant refill tool (like an Airlift system).
3. Draw Vacuum: Attach the tool to the surge tank, hook up shop air, and pull a vacuum on the system to roughly 24-26 inHg. Check for leak-down.
4. Introduce Coolant: Open the valve on the tool to draw the pre-mixed 50/50 Dex-Cool into the system without introducing air pockets.
5. Final Bleed: Once filled, run the engine with the heater set to maximum heat (both front and rear zones) to circulate the fluid. Monitor the surge tank level as the thermostat/rotary valve opens, topping off to the "Cold Fill" line as needed.

Common Cooling System Issues

The 2022 generation of the GMC Yukon is generally reliable, but its highly advanced cooling system does present a few unique challenges:

• Active Thermal Management (ATM) Valve Failures: The V8 engines use a rotary valve module instead of a traditional wax-pellet thermostat to direct coolant to specific areas of the engine for faster warm-ups. These modules can occasionally stick or fail electrically, leading to check engine lights (often throwing codes like P0128) or localized overheating.
• Water Pump Leaks: While improved over previous generations, GM V8 water pumps can still develop weeping from the weep hole or gasket as the vehicle approaches 80,000 to 100,000 miles.
• Air Pockets: As mentioned, if a DIYer attempts to drain and fill the coolant without a vacuum tool, trapped air can cause erratic heater performance and localized hot spots in the engine block.

If you are experiencing cooling system issues or simply need routine maintenance performed by a professional, don't leave it to chance. Find a trusted shop on Repairius.