2022 Jeep Gladiator Coolant Capacity, Type, and Maintenance Guide

The 2022 Jeep Gladiator holds between 11.2 and 13.4 quarts (10.6 to 12.7 liters) of coolant, depending on the engine size and whether it is equipped with the Max Tow package. Maintaining the proper coolant level and using the correct chemistry is absolutely vital for keeping your Gladiator's temperatures in check, especially if you are towing, off-roading, or crawling at low speeds.

Quick answer

Here is the essential information you need before servicing your Gladiator’s cooling system:

• Total cooling system capacity: 11.2 – 13.4 quarts (10.6 – 12.7 liters) depending on powertrain and options.
• OEM coolant spec: Mopar 10 Year/150,000 Mile Formula OAT (Organic Additive Technology). It is Purple in color, and the manufacturer specification number is MS-12106. Never mix this with older orange HOAT coolant!
• Mix ratio: 50/50 mixture of concentrated OAT coolant and distilled water, or a pre-mixed 50/50 OAT solution.

Capacity by engine option

Because the Gladiator JT platform offers different engine and towing configurations, the exact capacity varies. Below is a breakdown of the estimated coolant capacities by engine option for the 2022 model year.

Note: Always verify fluid levels via the reservoir dipstick or MAX/MIN lines after a drive cycle, as dry-fill capacities are rarely reached during a standard drain and fill.

Flush interval

To prevent internal corrosion, protect the water pump, and ensure peak thermal transfer, Jeep specifies the following service intervals for the OAT coolant:

• Normal Duty: Replace at 10 years or 150,000 miles, whichever comes first.
• Severe Duty: Replace every 5 years or 100,000 miles. Severe duty includes frequent towing, extensive off-roading, idling in hot climates, or heavy stop-and-go driving.

How to refill & bleed

The Pentastar and EcoDiesel engines can be prone to trapping air if not bled correctly. Follow these general steps:

1. Drain: Open the petcock at the bottom corner of the radiator and drain the old fluid into a catch pan.
2. Fill: Close the petcock. Slowly pour the 50/50 Mopar MS-12106 coolant into the coolant reservoir until it reaches the MAX line.
3. Bleed the 3.6L: Locate the small bleeder screw on the thermostat housing. Open it slightly while filling until a steady stream of coolant (no bubbles) comes out, then tighten it.
4. Burp the System: Leave the reservoir cap off. Start the engine and turn the cabin heater to maximum heat and low fan. Let it idle until it reaches operating temperature and the thermostat opens.
5. Top Off: As the air burps out, the level will drop. Add coolant as needed. Replace the cap once the level stabilizes.
6. Vacuum Fill (Recommended): For the 3.0L EcoDiesel—and ideally the 3.6L—using a vacuum coolant refill tool is highly recommended by technicians to pull a vacuum on the system, completely eliminating trapped air in the heater core and EGR coolers.

Common cooling system issues

For the JT Gladiator (and its JL Wrangler sibling), we see a few recurring cooling system issues in the shop:

• Oil Filter Housing/Cooler Leaks (3.6L): The plastic oil cooler and filter housing assembly sits in the valley of the V6. Over time, the seals degrade or the plastic cracks, causing coolant (and oil) to pool in the engine valley and run down the back of the engine block.
• Radiator Seam Leaks: The crimped seams where the plastic side tanks meet the aluminum radiator core are a known weak point on this generation, often causing slow, crusty purple leaks at the bottom corners.
• Water Pump Failure: Keep an eye out for a chirping pulley or pink/purple crust around the water pump weep hole, indicating the internal shaft seal has begun to fail.

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