The 2015 Jeep Grand Cherokee uses a closed cooling system that relies on a specific coolant type and reservoir locations. This article explains where to add coolant, how to identify the correct filling points, and best practices for maintaining the system to prevent overheating and engine damage. Clear steps and safety tips are provided to help owners perform a proper refill and basic maintenance.
Overview Of Coolant System
The cooling system circulates coolant between the engine and radiator to remove heat. In the 2015 Grand Cherokee, the system comprises a radiator, coolant reservoir, thermostat, water pump, radiator cap, and hoses. The reservoir serves as a fill point and expansion container, while the radiator cap is typically located on the radiator neck. Using the correct coolant type—usually a HOAT or OAT formula specified by Mopar—is essential for long-term reliability and corrosion protection. Regular checks help prevent overheating, freezing, and component wear.
Where To Add Coolant On The 2015 Jeep Grand Cherokee
Coolant is added primarily through the engine coolant reservoir, often referred to as the overflow tank. On most 2015 Grand Cherokee models, this reservoir is translucent plastic with level marks indicating Full Cold and Full Hot. The radiator itself may also have a cap, but access to adding coolant or topping off is generally through the reservoir. Before opening any part of the cooling system, ensure the engine is cool to avoid scalding from pressurized coolant. Always use the correct mix ratio recommended by the manufacturer.
Choosing The Right Coolant
Emissions-compliant, long-life coolant is recommended for the 2015 Grand Cherokee. Mopar-approved coolants or universal HOAT/OAT formulas that meet ASTM D3306 or Glysant standard specifications can be suitable if labeled for use with modern engines. Avoid mixing different coolant colors or types, as this can reduce protection and heat transfer efficiency. If the vehicle originally came with premixed coolant, you may simply top off with the same type. If you are unsure, check the owner’s manual or consult a dealer for the exact specification.
Coolant Capacity And Maintenance
The total coolant capacity for the 2015 Jeep Grand Cherokee varies slightly by engine and configuration but generally falls within the 10–12 quart range when fully drained and refilled. Regular maintenance includes inspecting for leaks, checking the reservoir level when the system is cold, and ensuring the level sits between the “Full Cold” and “Full Hot” marks. Leaks, slimy residue, or unusual pressure signs indicate a need for professional inspection. Replacing the coolant at the intervals recommended by Jeep helps preserve heater performance and corrosion protection.
Step By Step Refill Procedure
- Park on a level surface and ensure the engine is completely cool before opening the reservoir cap or radiator components.
- Locate the engine coolant reservoir; identify the level marks for cold and hot readings.
- Slowly loosen the cap of the reservoir to relieve any residual pressure, then remove the cap completely.
- Pour the recommended coolant mix into the reservoir up to the “Full Cold” line. If premixed, simply top off with the same premix.
- Check for air pockets by slowly adding coolant and removing the cap occasionally to allow air to escape (do not overfill).
- Reinstall the reservoir cap securely and start the engine with the heater on high to help bleed air from the cooling system.
- Let the engine reach normal operating temperature and monitor the coolant level; add more if necessary once the engine has cooled.
- Check for leaks around hoses, the reservoir, and the radiator cap. If any leaks are present, address them promptly.
Safety And Common Issues
Safety first: hot coolant can cause severe burns; never open the reservoir cap when the engine is hot. If you suspect a leak, overheating, or persistent low coolant warnings, have the cooling system inspected by a certified mechanic. Common issues include low coolant due to leaks, a failed thermostat causing overheating, and a worn radiator cap reducing pressure and boiling point. Using the wrong coolant type can lead to gelling, reduced heat transfer, and corrosion, so accuracy in specification is essential.