2015 Jeep Grand Cherokee Coolant Capacity & Type Guide

A 2015 Jeep Grand Cherokee holds between 11.1 and 16.0 quarts of coolant, depending on which engine your vehicle is equipped with. Keeping the cooling system full and maintained with the correct antifreeze is essential to protecting your engine from overheating in extreme conditions and preventing internal corrosion.

As an ASE-certified master technician, I've serviced hundreds of WK2-generation Grand Cherokees. This guide will walk you through exactly what type of coolant your Jeep needs, how much it holds, and how to properly maintain the system.

Quick Answer

• Total Cooling System Capacity: 11.1 to 16.0 quarts (10.5 to 15.2 liters) depending on engine size.
• OEM Coolant Spec: Mopar 10-Year/150,000 Mile Formula OAT (Organic Acid Technology). Manufacturer Spec Number: MS-12106.
• Coolant Color: Purple. (Note: Do NOT mix with the older Chrysler HOAT orange coolant used before 2013).
• Mix Ratio: 50/50 mixture of OAT concentrate and distilled water, or a pre-mixed 50/50 OAT solution.

Capacity by Engine Option

The 2015 Jeep Grand Cherokee was offered with four different engine configurations, each with its own specific cooling system capacity. If you are doing a complete dry fill, reference the table below. (Keep in mind that a standard drain-and-fill will usually take slightly less than the maximum capacity, as some fluid remains in the heater core and engine block).

Flush Interval

Chrysler’s purple OAT coolant is designed to be a long-life fluid, but it does degrade over time.

• Normal Duty: Replace the coolant every 10 years or 150,000 miles, whichever comes first.
• Severe Duty: If you frequently tow heavy loads, drive off-road, idle for long periods, or drive in dusty environments, it is highly recommended to inspect the coolant annually and perform a flush closer to the 5-year or 100,000-mile mark to ensure the corrosion inhibitors are still effective.

How to Refill & Bleed

Bleeding the air out of the 2015 Grand Cherokee cooling system is critical. Trapped air can lead to localized overheating, poor heater performance, and water pump damage.

1. Preparation: Ensure the engine is completely cold before removing the radiator cap.
2. Fill the System: Slowly pour the 50/50 mixed OAT coolant into the radiator neck until it reaches the base of the filler neck. Fill the coolant reservoir to the "MAX" line.
3. Bleed Screw (3.6L V6): If you have the 3.6L Pentastar, locate the air bleed screw on top of the thermostat housing. Open it slightly while filling the system until a steady stream of coolant (without air bubbles) comes out, then tighten it back down securely.
4. Burp the System: Leave the radiator cap off. Start the engine and turn the cabin heater to the maximum heat setting and lowest blower speed. Let the vehicle idle.
5. Monitor: As the thermostat opens (you'll feel the upper radiator hose get hot), the coolant level will drop. Continue topping off the radiator. Squeeze the upper radiator hose carefully to help push trapped air out.
6. Cap and Drive: Once the level stabilizes and no more bubbles appear, install the radiator cap. Drive the vehicle, let it cool down entirely, and recheck the reservoir level. Top off as needed over the next few days of driving.

Pro-Tip: To avoid air pockets altogether, professional technicians highly recommend using a vacuum-fill tool. This pulls a vacuum on the empty system and draws the new coolant in without introducing any air.

Common Cooling System Issues

When servicing the 2015 Jeep Grand Cherokee (part of the WK2 generation), there are a few common failure points to watch out for:

• 3.6L Oil Filter Housing/Cooler Assembly: This is arguably the most common issue on the Pentastar V6. The plastic housing, located in the valley of the engine block, is prone to cracking and leaking coolant and/or oil down the back of the engine.
• Radiator End Tanks: The plastic side tanks on the factory radiator are known to develop hairline cracks as they age and go through thermal cycles. Keep an eye out for crusty purple residue around the radiator seams.
• Water Pump Failures: Specifically on the V8 models, the water pump bearings and seals can wear out prematurely. Listen for a squeaking or grinding noise from the front of the engine, and check the weep hole on the pump for purple coolant trails.

If you don't feel comfortable tackling a coolant flush or repairing a leak on your own, don't risk your engine. Find a trusted shop on Repairius.