The 2018 Jeep Grand Cherokee offers multiple engine options, and the cooling system capacity varies with the specific powertrain. Accurate knowledge of the coolant capacity helps ensure proper maintenance, prevent overheating, and extend engine life. This article explains typical cooling system capacities for common 2018 Grand Cherokee configurations, the recommended coolant type, and best practices for checking and refilling the system. Readers should always confirm exact specifications in the owner’s manual or with a certified mechanic for their vehicle’s exact build.
Overview Of Cooling System And Importance
The cooling system circulates coolant through the engine, radiator, heater core, and water pump to regulate operating temperature. An incorrect coolant amount or inappropriate mix ratio can lead to overheating, reduced efficiency, and potential engine damage. The system uses a 50/50 mix of ethylene glycol antifreeze and distilled water in standard ambient conditions, though some climates may benefit from slight adjustments. Regular inspection of hoses, clamps, and the radiator cap is essential, as leaks can reduce capacity and cooling performance.
Engine Variants And Capacity
Cooling system capacity for the 2018 Grand Cherokee depends on the engine family. Capacity is usually measured as total system capacity, including the radiator, engine block, heater core, and coolant passages.Note that exact figures can vary by model trim and factory options. The following ranges reflect common configurations frequently reported by owners and service data:
- 3.6L V6 engine — approximately 11.5 to 12.5 quarts (about 11 to 12 liters).
- 5.7L Hemi V8 engine — roughly 15 to 17 quarts (about 14 to 16 liters).
- 3.0L EcoDiesel V6 — around 12 to 14 quarts (about 11 to 13 liters).
These figures include the coolant in the radiator, engine block, and heater core. If a service manual specifies a different range for a particular vehicle build, defer to that specification. When in doubt, a mechanic can measure the system capacity through a full drain and refill procedure with the vehicle at operating temperature.
Recommended Coolant Types And Mixture
Jeep generally recommends a high-quality coolant meeting OEM specifications. For many modern Chrysler family vehicles, including the Grand Cherokee, a conventional or HOAT (silicated organic acid technology) coolant with a 50/50 mix of ethylene glycol and distilled water is standard. In cold climates, a 50/50 mix provides freezing protection to about -34°F (-37°C) and boiling protection up to 265°F (129°C) with proper pressure cap ratings.
Key guidelines:
- Use the coolant type specified in the owner’s manual or by a Jeep dealer. If a universal coolant is used, ensure it is compatible with the cooling system’s materials (aluminum, plastic, rubber seals).
- Avoid mixing different brands or types once the system is established; flushing may be required to prevent precipitates or corrosion.
- Inspect the coolant for color changes, sediment, or oil contamination, which can indicate leaks or head gasket issues.
How To Check And Refill The Coolant
Proper checking and refilling help maintain the correct coolant volume and mixture. Follow these steps carefully, and always consult the owner’s manual for vehicle-specific instructions.
- Ensure the engine is cold before inspecting the overflow reservoir to avoid burns from hot coolant.
- Check the coolant level in the reservoir; it should be between the “MIN” and “MAX” marks. Do not rely solely on the radiator fill line unless you are performing a full flush.
- If the level is low, add a 50/50 coolant-to-water mixture until it reaches the recommended level. Use a funnel to prevent spills.
- For a full coolant refill, old coolant should be drained from the radiator and engine block, the system flushed, and a new 50/50 mix introduced. This is best done with the engine slightly warm but not hot and with appropriate safety precautions.
- Bleed air from the cooling system if your model requires it. Some Grand Cherokee variants have bleed procedures to remove trapped air and ensure consistent cooling performance.
- After refilling, run the engine to operating temperature with the radiator cap loose for a brief period to help air escape, then top off as needed and reinstall the cap securely.
Maintenance Tips And Common Pitfalls
Regular maintenance helps prevent cooling system problems and preserves engine health. Consider the following tips and common pitfalls:
- Schedule periodic coolant flushes according to the maintenance schedule or every 60,000 miles (96,000 kilometers) if you drive under severe conditions. Flushing removes corrosion byproducts and maintains proper flow.
- Inspect hoses for cracks, bulges, or leaks. Replace any damaged hoses promptly to prevent sudden failures and coolant loss.
- Check the radiator cap for proper sealing and correct pressure rating. A faulty cap can cause pressure loss and overheating.
- Monitor for signs of coolant loss, white exhaust, sweet-smelling steam, or oily residue, which can indicate leaks, head gasket issues, or other faults requiring professional attention.
- Avoid running the engine with a low coolant level, as it can lead to overheating and damage to the water pump and head gaskets.
FAQ: Common Questions About 2018 Grand Cherokee Coolant
Below are concise answers to frequent questions drivers ask about coolant in the 2018 Grand Cherokee:
- Q: Can I use any brand of coolant in my Grand Cherokee? A: Use the coolant type specified in the owner’s manual or by a Jeep dealer. Compatibility with aluminum and plastic components is essential to avoid corrosion.
- Q: Do I need to flush the cooling system when refilling with a new coolant? A: It’s recommended for a full drain and refill to ensure a clean and balanced system, especially if switching coolant types or if the system shows signs of contamination.
- Q: How often should the coolant be replaced? A: Most maintenance schedules call for a coolant drain and refill every 60,000 miles or as specified by the manufacturer, with more frequent changes in severe driving conditions.
Safety Considerations And Final Notes
Working with cooling system components can be hazardous due to high temperatures and pressurized coolant. Wear eye protection and gloves, ensure the engine is cool before opening the radiator cap, and dispose of old coolant according to local environmental guidelines. If there is any uncertainty about the correct capacity for a specific 2018 Grand Cherokee configuration, consult the official service manual or contact a Jeep dealership for precise figures and procedures.