Your 2018 Jeep Cherokee is more than just a vehicle; it’s a trusty companion for daily commutes and epic off-road adventures. But like any hard-working machine, its heart – the engine – needs the right care to keep ticking. And when it comes to engine health, few things are as critical as the proper coolant.
Choosing the wrong fluid can lead to catastrophic engine damage, costly repairs, and leave you stranded far from home. If you’re wondering about the exact 2018 Jeep Cherokee coolant type, you’ve come to the right place. We’re here to cut through the confusion and provide the definitive guide to keeping your Jeep’s cooling system in top shape.
This comprehensive article will detail the specific coolant your 2018 Cherokee requires, explain why it matters, and walk you through checking, topping off, and even performing a full flush. Get ready to empower your inner DIY mechanic!
Understanding Your 2018 Jeep Cherokee Coolant Type
Let’s get straight to the point: the 2018 Jeep Cherokee coolant type is crucial. Modern engines, especially those in Jeeps, are engineered to incredibly precise tolerances. Using the wrong coolant can lead to serious issues over time.
For your 2018 Jeep Cherokee, whether it’s equipped with the 2.4L Tigershark MultiAir 2, the 3.2L Pentastar V6, or any other variant, the manufacturer specifies a specific type of coolant. This isn’t just a suggestion; it’s a requirement for optimal performance and longevity.
The Mopar OAT Coolant Specification
The correct coolant for your 2018 Jeep Cherokee is a Purple/Pink OAT (Organic Acid Technology) coolant. Specifically, you’re looking for Mopar Antifreeze/Coolant 10 Year/150,000 Mile Formula, or an equivalent that meets the Chrysler Material Standard MS-90032.
This OAT coolant is distinct from older IAT (Inorganic Acid Technology) green coolants or even HOAT (Hybrid Organic Acid Technology) formulas. Its unique chemical composition provides long-lasting corrosion protection and heat transfer properties tailored for your Jeep’s engine materials.
Mixing different coolant types can lead to chemical reactions. These reactions can cause gelling, sludge formation, and a breakdown of corrosion inhibitors. This significantly reduces the cooling system’s effectiveness and can damage the radiator, water pump, and heater core.
Identifying OAT Coolant by Color
While color can be a helpful indicator, it’s not foolproof. The specified OAT coolant for your 2018 Jeep Cherokee is typically purple or pink in color. However, always verify the product’s label to ensure it meets the MS-90032 specification.
Never rely solely on color when selecting coolant. Always read the product description carefully. Confirm it explicitly states compatibility with Chrysler, Dodge, Jeep, or Ram vehicles requiring MS-90032 OAT coolant.
Why Using the Correct Coolant Matters for Your Jeep
It’s easy to think “coolant is coolant,” but that’s a dangerous misconception. The specific formulation of the OAT coolant for your 2018 Jeep Cherokee plays several vital roles beyond just preventing overheating.
These specialized coolants are designed to protect your engine’s delicate internal components. They prevent corrosion, lubricate moving parts, and maintain stable temperatures across a wide range of operating conditions. Especially for off-road enthusiasts, this is non-negotiable.
Corrosion Protection and Material Compatibility
Modern engines use a mix of materials, including aluminum, cast iron, copper, and various plastics and rubbers. The OAT coolant’s inhibitors are specifically formulated to protect these diverse materials from rust and corrosion without damaging seals or gaskets.
Traditional coolants, if introduced, can react negatively with aluminum components. This leads to pitting, leaks, and premature failure of parts like the radiator or cylinder heads. This is why the precise 2018 Jeep Cherokee coolant type is so critical.
Preventing Overheating and Freezing
This is the most obvious function. Coolant transfers heat away from the engine, maintaining optimal operating temperatures. In extreme conditions, like crawling up a steep trail or sitting in heavy traffic, a properly functioning cooling system is paramount.
Conversely, in freezing temperatures, coolant prevents the water in the system from expanding and cracking engine blocks or radiators. The OAT formula offers excellent thermal stability and freeze protection, essential for varied climates and off-road excursions.
Lubrication of Water Pump Seals
The water pump is a critical component that circulates coolant throughout the engine. The inhibitors in the OAT coolant also provide lubrication for the water pump’s seals and bearings. This helps to extend the life of the pump and prevent costly failures.
Using an incorrect coolant can degrade these seals, leading to leaks and eventual water pump failure. A failing water pump can quickly lead to engine overheating and significant damage.
Checking and Topping Off Your Jeep Cherokee’s Coolant
Regularly checking your coolant level is a simple, yet vital maintenance task. It can prevent minor issues from becoming major headaches, especially before a long trip or hitting the trails.
Always perform this check when the engine is cold. The coolant system is pressurized when hot, and opening the cap can cause scalding hot fluid to spray out. Safety first!
Step-by-Step Coolant Level Check
- Ensure Engine is Cold: Wait several hours after driving, or perform the check first thing in the morning.
- Locate the Coolant Reservoir: In your 2018 Jeep Cherokee, this is usually a translucent plastic tank with “MIN” and “MAX” lines, typically located near the radiator.
- Inspect the Level: The coolant level should be between the “MIN” and “MAX” marks. If it’s below “MIN,” it needs topping off.
- Check for Leaks: While you’re there, visually inspect hoses, the radiator, and around the engine for any signs of pink or purple residue, which indicates a leak.
If you frequently find your coolant level low, it’s a sign of a potential leak. Don’t ignore it. A slow leak can escalate into a major problem, especially when you’re far from civilization.
How to Top Off Coolant
If your coolant level is low, topping it off is straightforward. Use only the specified Mopar MS-90032 OAT coolant, or an approved equivalent. Do not use plain water, especially in cold climates, and avoid mixing different types.
- Open the Reservoir Cap: Slowly twist the cap counter-clockwise to relieve any residual pressure, then remove it.
- Add Coolant: Carefully pour the correct 50/50 pre-mixed coolant into the reservoir. Fill it to the “MAX” line.
- Replace Cap: Securely tighten the reservoir cap until it clicks or seats firmly.
- Monitor: Check the level again after your next few drives to ensure it remains stable.
If you’re in a pinch and only have concentrated coolant, remember to dilute it with distilled water to a 50/50 ratio before adding. Never use tap water, as its minerals can cause deposits and corrosion in your cooling system.
Performing a Coolant Flush and Fill on Your 2018 Cherokee
While topping off is important, a full coolant flush and fill is a more comprehensive maintenance task. Jeep recommends specific service intervals for this, typically around 10 years or 150,000 miles for the long-life OAT coolant. Always consult your owner’s manual for the exact schedule.
A flush replaces all the old, degraded coolant with fresh fluid. This ensures maximum protection against corrosion, freezing, and overheating. This is a DIY job for the confident mechanic, but don’t hesitate to seek professional help if unsure.
Tools and Materials You’ll Need
- New Mopar MS-90032 OAT coolant (usually 2-3 gallons for a full system, check your manual for capacity)
- Distilled water (several gallons for flushing)
- Large drain pan (at least 5-gallon capacity)
- Funnel
- Socket wrench set and pliers
- Safety glasses and chemical-resistant gloves
- Rags or shop towels
- Torque wrench (for drain plug)
- Coolant system pressure tester (optional, but recommended for checking leaks)
Detailed Flush and Fill Procedure
- Safety First: Ensure the engine is completely cold. Wear safety glasses and gloves. Position your Jeep on a level surface with the front slightly elevated if possible, to aid draining.
- Locate Drain Plug: Place the drain pan beneath the radiator drain plug (petcock), usually located on the bottom of the radiator. Some Cherokees may have a drain hose.
- Drain Old Coolant: Slowly open the radiator drain plug. If your Jeep has a radiator cap (not just a reservoir cap), open it to allow air in and facilitate draining. Allow all coolant to drain into the pan.
- Close Drain Plug: Once drained, close the drain plug securely. Do not overtighten, as it’s often plastic.
- Flush with Distilled Water (Optional but Recommended): For a thorough flush, refill the system with distilled water. Run the engine with the heater on high until it reaches operating temperature (thermostat opens). Let it cool, then drain the distilled water. Repeat this step until the drained water is clear.
- Refill with New Coolant: Close the drain plug. Using a funnel, slowly fill the radiator and reservoir with the new 50/50 pre-mixed 2018 Jeep Cherokee coolant type (Mopar MS-90032 OAT).
- Bleed the System: This is critical to prevent air pockets. Start the engine with the heater on high and the reservoir cap off. Let it run until it reaches operating temperature. As the engine warms, air bubbles will escape. You may need to gently squeeze the upper radiator hose to help release trapped air. Keep an eye on the coolant level and top off as needed.
- Check for Leaks: After bleeding, replace the reservoir cap. Take your Jeep for a short drive. Let it cool, then recheck the coolant level and inspect for any leaks. Top off if necessary.
- Proper Disposal: Collect all old coolant and distilled water in sealed containers. Never pour used coolant down the drain or onto the ground. It is toxic. Take it to an automotive parts store or a local hazardous waste facility for proper disposal.
This process ensures your cooling system is free of old, depleted coolant and air pockets. This extends the life of your engine and prevents overheating, especially crucial when pushing your Jeep off-road.
Common Coolant Problems and Troubleshooting
Even with the correct 2018 Jeep Cherokee coolant type, issues can arise. Knowing how to identify and troubleshoot common cooling system problems can save you from a breakdown.
Vigilance is key. Pay attention to your temperature gauge, any unusual smells, or visible leaks. Early detection can prevent minor issues from becoming major engine damage.
Overheating Engine
If your temperature gauge climbs into the red, pull over immediately and shut off the engine. Do not continue driving. This could indicate:
- Low coolant level (due to a leak or evaporation).
- A faulty thermostat (stuck closed).
- A failing water pump.
- A clogged radiator or cooling fins.
- A malfunctioning cooling fan.
- A blown head gasket.
Once the engine cools, check the coolant level. If low, top it off. If it continues to overheat, it’s best to have it professionally diagnosed. Continuing to drive an overheating engine can cause irreversible damage.
Coolant Leaks
Visible puddles of pink/purple fluid under your Jeep are a clear sign of a leak. Common leak points include:
- Radiator hoses (check for cracks, softness, or bulges).
- Radiator itself (look for wet spots or residue on the fins).
- Water pump (leaks from the weep hole).
- Heater core (often indicated by coolant smell inside the cabin or foggy windows).
- Reservoir tank or cap.
A small leak can often be repaired by replacing a hose or clamp. Larger leaks, or those from the radiator or water pump, may require more extensive repairs. Address any leaks promptly.
Contaminated Coolant
If your coolant appears sludgy, rusty, or oily, it’s contaminated. Sludge can indicate internal corrosion or mixing of incompatible coolants. Oil in the coolant (or vice versa) often points to a blown head gasket or a cracked engine block.
Contaminated coolant significantly reduces cooling efficiency and accelerates wear on system components. A full system flush is necessary, and underlying issues like a head gasket problem must be addressed immediately.
Off-Roading with Optimal Cooling: What to Watch For
Off-roading puts extra stress on your Jeep’s cooling system. Slow speeds, heavy loads, steep climbs, and dusty environments all contribute to higher engine temperatures. Ensuring your 2018 Jeep Cherokee coolant type is correct and system is maintained is even more critical here.
Before hitting the trails, always perform a thorough inspection. Check your coolant level, inspect hoses for wear, and ensure your radiator fins are clean and free of mud or debris. A few minutes of preventative maintenance can save your adventure.
Pre-Trail Inspection Checklist
- Coolant Level: Confirm it’s at the “MAX” line.
- Hoses and Clamps: Check for cracks, bulges, and tight connections.
- Radiator Fins: Ensure they are clear of mud, leaves, and bugs for maximum airflow.
- Fan Operation: Listen for your cooling fan engaging when the engine gets hot.
- Coolant Color: Look for the bright pink/purple color, not murky or brown.
Consider carrying a spare gallon of the correct pre-mixed coolant and distilled water. This can be a lifesaver for topping off in an emergency, especially when you’re far from any auto parts store.
Monitoring During Off-Roading
Keep a close eye on your temperature gauge. If it starts to climb:
- Turn on Heater: This can sometimes help dissipate engine heat by using the heater core as a mini-radiator.
- Reduce Load: Shift to a lower gear, reduce speed, or pull over if safe.
- Check for Obstructions: If safe to do so, quickly check the radiator for mud or debris blocking airflow.
- Seek Higher Ground: If you’re stuck in deep mud or sand, the engine will work harder. Try to move to firmer ground if possible.
If overheating persists, it’s safer to shut down the engine and let it cool. Overheating on the trail can lead to a long, expensive tow out. Always prioritize engine health over pushing through.
Frequently Asked Questions About 2018 Jeep Cherokee Coolant Type
Can I mix different colors of coolant in my 2018 Jeep Cherokee?
No, absolutely not. Coolant color often indicates its chemical composition. Mixing different types, especially OAT with IAT or HOAT, can lead to chemical reactions, gelling, and severe damage to your cooling system and engine. Always use the specified Mopar MS-90032 OAT coolant.
What happens if I use the wrong coolant in my 2018 Jeep Cherokee?
Using the wrong coolant can cause a range of problems, including corrosion, cavitation, gasket failure, reduced heat transfer, and sludge formation. These issues can lead to engine overheating, premature component failure (like the water pump or radiator), and costly repairs down the line.
How often should I change the coolant in my 2018 Jeep Cherokee?
For the long-life Mopar MS-90032 OAT coolant, the recommended service interval is typically 10 years or 150,000 miles, whichever comes first. However, always refer to your owner’s manual for the precise maintenance schedule for your specific model and engine. Regular checks for level and condition are still essential.
Can I just add water if my coolant level is low?
In an emergency, adding a small amount of distilled water is better than running completely dry. However, it’s not a long-term solution. Water dilutes the coolant’s antifreeze and corrosion protection properties. Always aim to top off with a 50/50 mix of the correct OAT coolant and distilled water.
What does “OAT” mean for coolant?
“OAT” stands for Organic Acid Technology. This refers to the type of corrosion inhibitors used in the coolant. OAT coolants are known for their long service life and specific compatibility with modern engine materials, offering superior protection over extended periods compared to older coolant technologies.
Conclusion
Understanding and maintaining the correct 2018 Jeep Cherokee coolant type is fundamental to the health and longevity of your vehicle. By using the specified Mopar MS-90032 OAT coolant, regularly checking your levels, and performing timely flushes, you’re protecting your investment and ensuring reliable performance on and off the road.
Don’t cut corners when it comes to your cooling system. A little preventative maintenance goes a long way in preventing costly repairs and keeping your adventures rolling smoothly. Whether you’re a seasoned DIYer or just starting, empowering yourself with this knowledge means a safer, more enjoyable journey in your 2018 Jeep Cherokee.
Stay informed, stay safe, and happy trails!
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