Top up the expansion reservoir when the level is low, using the correct premixed coolant. Do this with the engine cold, never open the radiator cap when hot, and verify the coolant type specified in the owner's manual. If the level remains low after topping up, have the cooling system inspected for leaks.
What you’ll need
Before you start, gather items that ensure a clean, safe refill and avoid contaminating the cooling system. The Palisade typically uses an ethylene glycol–based HOAT coolant, and most owners will use a premixed 50/50 solution. Always check the owner's manual for the exact specification.
- Coolant approved for Hyundai Palisade (premixed 50/50 or the exact specification in your manual)
- Distilled water (only if using concentrated coolant and dilution is required by the manual)
- Clean funnel
- Gloves and eye protection
- Rags or towels for spills
- Flashlight if needed to inspect the reservoir clearly
Having these items on hand helps you fill safely, minimizes spills, and ensures the correct mixture is used.
Locating and assessing the coolant reservoir
The expansion/overflow reservoir is a translucent plastic tank in the engine bay, typically near the front of the engine compartment. Check the level with the engine cold—the coolant should be between the MIN and MAX marks on the side of the bottle. If it sits below MIN, you’ll need to add coolant carefully.
Step-by-step: topping up the coolant
Follow these steps to add coolant to the Palisade correctly and safely.
- Park on level ground and ensure the engine is completely cold before proceeding.
- Open the hood and locate the expansion/overflow reservoir cap. Do not remove the radiator cap when the engine is hot.
- Wipe the cap and surrounding area to prevent dirt from entering the reservoir.
- Carefully loosen and remove the reservoir cap, placing it in a clean area.
- Check the coolant level on the side of the reservoir. If it is between MIN and MAX, add only enough coolant to bring it to MAX. If it’s below MIN, add gradually in small increments.
- Pour coolant slowly using a funnel to avoid spills. Use a premixed coolant (50/50) unless your manual specifies a different ratio; never mix coolant types.
- Replace the reservoir cap and tighten it until secure.
- Start the engine and run it with the heater on for several minutes (or as recommended in the manual) to help any air pockets escape from the cooling system. Monitor the coolant level while the engine runs if your manual allows.
- Turn off the engine and let it cool completely, then recheck the reservoir level and top up to MAX if needed.
After topping up, keep an eye on the level over the next few days for any drops, which could indicate a leak or another issue in the cooling system.
Bleeding the system and safety notes
Some vehicles require a bleed procedure to remove air pockets after a refill. If you notice persistent air pockets or overheating, consult the owner’s manual or a Hyundai service technician. Never open hot cooling system components and always use protective gear when handling coolant.
What to do if coolant keeps dropping
If the reservoir level continues to fall despite topping up, there may be a leak, a faulty reservoir cap, a hose issue, or a failing water pump. Schedule service promptly to avoid engine overheating and potential damage.
Summary
To add coolant to a Hyundai Palisade, use the expansion tank, ensure the engine is cold, and fill with the correct premixed coolant up to the MAX line. Do not open the radiator cap when hot, and avoid mixing coolant types. After topping up, run the engine to circulate the fluid and recheck the level when cool. If levels keep dropping, seek professional service to diagnose leaks or other mechanical problems.