2022 Chevrolet Suburban Coolant Capacity & Type Guide

Depending on your exact engine and whether your vehicle is equipped with a rear heating system, the 2022 Chevrolet Suburban holds between 15.5 quarts (14.7 liters) and 18.1 quarts (17.1 liters) of coolant. As an ASE-certified master technician, I regularly service these full-size GM SUVs, and maintaining the proper coolant level and chemistry is critical to protecting your powertrain and ensuring your front and rear HVAC systems blow hot air when you need them.

Below is your comprehensive guide to the 2022 Chevrolet Suburban's cooling system, including capacities, the exact OEM fluid specifications, and maintenance procedures.

Quick Answer

• Total Cooling System Capacity: 15.5 – 18.1 quarts (14.7 – 17.1 liters) depending on engine and rear climate control options.
• OEM Coolant Spec: DEX-COOL (OAT – Organic Acid Technology, typically orange or pink in color). It must meet the GM specification GMW3420.
• Mix Ratio: 50/50 mixture of DEX-COOL concentrate and clean, drinkable water (preferably distilled or deionized), or pre-mixed 50/50 DEX-COOL. In extremely cold climates (below -34°F / -37°C), a 60/40 mix of coolant to water can be used, but never exceed 70% coolant.

Capacity by Engine Option

The 2022 Chevrolet Suburban was offered with three distinct engine options. Because the Suburban is a massive three-row SUV, most models are equipped with rear heating, which requires longer heater hoses and a secondary heater core, significantly increasing the total coolant capacity.

Note: Always verify your specific RPO codes or check the owner's manual, as towing packages or severe-duty cooling packages may slightly alter these numbers.

Flush Interval

General Motors utilizes extended-life DEX-COOL coolant in the 2022 Suburban, which provides excellent long-term corrosion protection. However, it still breaks down over time.

• Normal / Severe Duty: GM recommends draining, flushing, and refilling the cooling system every 150,000 miles or 5 years, whichever comes first.
• Technician Tip: If you frequently tow heavy trailers, idle for extended periods, or drive in extremely hot environments (like the desert Southwest), I recommend checking the coolant's freeze point and pH level around the 4-year or 100,000-mile mark to ensure the OAT additives are still active.

How to Refill & Bleed

Refilling the cooling system on a modern Suburban—especially one with rear heat—can be tricky because air pockets easily become trapped in the long lines running to the back of the vehicle.

1. Drain the System: With the engine cold, remove the surge tank cap and open the radiator drain petcock.
2. Vacuum Fill (Recommended): The absolute best way to refill these modern GM systems without air locks is by using a pneumatic vacuum coolant refiller. This pulls a deep vacuum on the system, checks for leaks, and rapidly draws the 50/50 DEX-COOL mix into every crevice, including the rear heater core.
3. Manual Refill (If vacuum tool is unavailable): Slowly pour the 50/50 DEX-COOL mixture into the surge tank until it reaches the "COLD FILL" line.
4. Bleeding Procedure: Start the engine and turn the front and rear heaters to their highest temperature settings with the fans on low. This opens the valves to the heater cores. Let the engine idle until it reaches normal operating temperature and the thermostat opens (the upper radiator hose will get hot).
5. Top Off: As the thermostat opens and air is purged into the surge tank, the fluid level will drop. Carefully add coolant to keep it at the proper line. Shut the engine off, let it cool completely, and check the level again.

Common Cooling System Issues

While the 2022 Chevrolet Suburban is a newer vehicle, it shares powertrain architecture with the previous generation of GM trucks, giving us a good idea of what to watch out for:

• Water Pump Leaks: The 5.3L and 6.2L V8 engines have a history of water pump weep hole leaks as they age. Keep an eye out for orange crust or drips near the center of the engine block behind the cooling fan.
• Thermostat Housing Failures: The integrated thermostat and housing can occasionally stick open, resulting in a Check Engine Light (often code P0128 - Coolant Thermostat Below Thermostat Regulating Temperature).
• Radiator End Tank Seepage: On vehicles that see heavy towing or rough roads, the plastic end tanks on the radiator can begin to seep where they are crimped to the aluminum core.

If you suspect a leak, are dealing with an overheating engine, or are simply due for your 5-year coolant flush, don't leave it to chance. Find a trusted shop on Repairius.