2018 Jeep Grand Cherokee Coolant Capacity & Type

The 2018 Jeep Grand Cherokee cooling system holds approximately 13.0 to 14.0 quarts (12.3 to 13.2 liters) of coolant, depending on the engine. It is crucial to use the correct OAT (Organic Additive Technology) coolant specifically formulated to Chrysler's MS-12106 specification to ensure proper cooling system function and longevity.

Quick Answer

• Total Cooling System Capacity: Approximately 13.0 - 14.0 quarts (12.3 - 13.2 liters)
• OEM Coolant Spec: Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula OAT (Organic Additive Technology), Purple in color, meeting Chrysler Material Standard MS-12106.
• Mix Ratio: 50/50 prediluted or mix 1 part concentrate with 1 part demineralized water.

Capacity by Engine Option

The 2018 Jeep Grand Cherokee was offered with several engine options, and the cooling system capacity can vary slightly:

Always consult your owner's manual for the most accurate and specific capacity for your vehicle's configuration.

Flush Interval

Maintaining your cooling system with regular flushes is critical for the health of your 2018 Jeep Grand Cherokee.

• Normal Duty: Replace initially at 10 years or 150,000 miles, then every 5 years or 75,000 miles thereafter.
• Severe Duty: If you frequently tow, drive in extreme temperatures, or operate under dusty conditions, it's advisable to inspect your coolant more frequently and consider replacing it every 5 years or 75,000 miles.

Always adhere to the intervals specified in your owner's manual.

How to Refill & Bleed

Properly refilling and bleeding the cooling system after a drain or component replacement is essential to prevent air pockets, which can lead to overheating. For the 2018 Jeep Grand Cherokee, the process generally involves:

1. Preparation: Ensure the engine is cool. Place a drain pan under the radiator. Open the radiator drain cock (petcock) and remove the radiator cap to allow the system to drain completely.
2. Flush (Optional but Recommended): If performing a full flush, close the drain cock and fill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature. Drain, and repeat until the water runs clear. Never use tap water for flushing or mixing coolant.
3. Refill: Close the radiator drain cock. Slowly fill the coolant reservoir with the specified Mopar OAT coolant (50/50 mix). Filling slowly helps prevent air from getting trapped.
4. Bleeding without a Bleed Screw: The 2018 Jeep Grand Cherokee cooling system is largely self-bleeding. Start the engine with the heater on high and the radiator cap off (or slightly loose). Allow the engine to run until it reaches operating temperature and the thermostat opens (you'll see coolant begin to flow). As the engine warms, air bubbles will rise and escape through the radiator fill neck. You may need to gently squeeze the upper and lower radiator hoses to help dislodge air pockets.
5. Maintain Level: As air escapes, the coolant level in the reservoir will drop. Continue to add coolant to the reservoir to maintain the "FULL" cold level. Once the engine reaches operating temperature and no more air bubbles are visible, install the radiator cap.
6. Final Check: Drive the vehicle, monitoring the temperature gauge. After the engine has cooled completely, recheck the coolant level in the reservoir and top off if necessary.

Important Note: Some specialized tools like a vacuum filler can greatly simplify and ensure a complete fill and bleed, especially after extensive repairs. If you're uncomfortable with this procedure, it's best to consult a professional.

Common Cooling System Issues

Owners of 2018 Jeep Grand Cherokees, like many vehicles, can experience several cooling system-related issues. For this generation, some common concerns include:

• Water Pump Leaks: The water pump is a common failure point across many vehicles, and the Grand Cherokee is no exception. Leaks can develop over time, often indicated by coolant weeping from the weep hole or a drop in coolant level.
• Radiator Leaks: Radiators can develop leaks due to corrosion, impact damage, or deterioration of plastic end tanks. Keep an eye out for coolant puddles under the vehicle or a sweet smell.
• Thermostat Housing Leaks: The thermostat housing, often made of plastic, can become brittle and crack over time, leading to coolant leaks.
• Coolant Reservoir/Hose Leaks: Hoses can degrade, crack, or clamps can loosen, causing leaks. The coolant reservoir itself can also crack or develop leaks.
• Heater Core Issues: While less common, a clogged or leaking heater core can lead to a lack of cabin heat or a sweet smell inside the vehicle, along with potential fogging of windows.
• Incorrect Coolant Use: Using the wrong type of coolant (e.g., IAT or HOAT instead of OAT MS-12106) can lead to serious issues, including corrosion, premature water pump failure, and silicate dropout, which can clog the cooling system.

Regular inspection and adherence to the recommended maintenance schedule can help mitigate these issues. Always use the specified OAT coolant to prevent compatibility problems.

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