🔧 Ioniq - Radiator Hose Replacement

Replacing a radiator hose on your Ioniq means draining some engine coolant, swapping the old rubber hose for a new one, then refilling and bleeding air out of the cooling system. A worn hose can leak, swell, or split and quickly cause overheating.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Work only on a fully cool engine; hot coolant can spray and burn.
• ⚠️ Wear gloves and safety glasses; coolant is toxic and slippery.
• ⚠️ Hybrid caution: avoid pulling on any orange high-voltage cables; this job is on the engine coolant hose, not the hybrid/inverter coolant circuit.
• ⚠️ Support the car with jack stands if you go underneath; never rely on a jack alone.
• ⚠️ Battery disconnect is usually not required for a radiator hose, but keep the key fob away and the car OFF.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Drain pan (at least 2-gallon)
• Trim clip removal tool
• Flat-blade screwdriver
• Hose clamp pliers
• Channel-lock pliers
• Pick tool set
• Shop rags
• Funnel
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• 10mm socket
• Ratchet
• Extension bar (3-inch)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Upper radiator hose - Qty: 1
• Lower radiator hose - Qty: 1
• Radiator hose clamps - Qty: 2-4
• Hyundai/Kia Long Life coolant (P-OAT) pre-mixed - Qty: 1-2 gallons
• Undercover/undertray clips - Qty: 2-6

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Let the engine cool completely (at least 2-3 hours).
• Put wheel chocks behind the rear wheels.
• Decide which hose you’re replacing: the upper hose runs from the top of the radiator to the engine; the lower hose runs from the bottom of the radiator to the engine.
• Tip: Take a photo before removal.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve any leftover pressure

• Place a drain pan (at least 2-gallon) under the front of the car.
• Slowly loosen the coolant reservoir/pressure cap by hand using a shop rag over it, then remove it once you’re sure there’s no pressure.

Step 2: Raise the front (needed for lower hose access)

• Chock the rear wheels with wheel chocks.
• Lift the front with a floor jack (rated 3-ton minimum) at the proper front lift point.
• Set the car securely on jack stands (rated 3-ton minimum).

Step 3: Remove the lower engine undercover (if equipped)

• Remove the plastic clips using a trim clip removal tool.
• Remove any small bolts using a 10mm socket, ratchet, and extension bar (3-inch).
• Set the undercover and hardware aside in a small pile so nothing gets lost.

Step 4: Drain enough coolant so the hose swap doesn’t gush

• Position the drain pan (at least 2-gallon) under the radiator’s lower area.
• Open the radiator drain cock (petcock) carefully by hand or with a flat-blade screwdriver if needed.
• Drain until the coolant level is below the hose you’re replacing, then close the drain cock.
• Tip: Only drain what you need.

Step 5A: Remove and replace the UPPER radiator hose (top hose path)

• Locate the upper hose at the top of the radiator and at the engine connection.
• Move the spring clamps back using hose clamp pliers (spring clamp = a clamp you squeeze, not screw-tighten).
• Twist the hose to break it free using channel-lock pliers gently, then pull it off by hand.
• If it’s stuck, carefully work the edge with a pick tool set to break the seal (do not gouge the radiator neck).
• Wipe the radiator and engine hose necks clean using shop rags.
• Install the new upper hose fully seated in the same orientation.
• Reposition the clamps in the same spots using hose clamp pliers.

Step 5B: Remove and replace the LOWER radiator hose (bottom hose path)

• From underneath, locate the lower hose at the bottom of the radiator and at the engine-side connection.
• Move the spring clamps back using hose clamp pliers.
• Twist the hose to break it free, using channel-lock pliers gently, then pull the hose off.
• Expect some coolant to spill; keep the drain pan (at least 2-gallon) directly under the hose ends.
• Clean the sealing surfaces with shop rags.
• Install the new lower hose fully seated, then reinstall the clamps using hose clamp pliers.

Step 6: Reinstall the undercover (if removed)

• Reinstall the undercover using the 10mm socket and ratchet.
• Reinstall plastic clips using the trim clip removal tool (replace any broken clips).

Step 7: Refill coolant

• Lower the car off the stands using the floor jack (rated 3-ton minimum).
• Fill the coolant reservoir/pressure tank using a funnel with Hyundai/Kia Long Life coolant (P-OAT) pre-mixed.
• Fill to the “MAX” line (or just below it if you expect expansion).

Step 8: Bleed air and verify operation

• Start the car and set the cabin heat to HOT (this helps circulate coolant through the heater core).
• Let the engine reach operating temperature while watching the temperature gauge and looking for leaks.
• With the engine idling, carefully squeeze the upper hose by hand using nitrile gloves to help push trapped air out.
• Shut the car OFF, let it cool, then recheck the coolant level and top off using the funnel.

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✅ After Repair

• Check for drips around both ends of the replaced hose with the engine running.
• Take a short 10-15 minute drive, then recheck for leaks and recheck coolant level after a full cool-down.
• Make sure the heater blows hot and the engine temperature stays normal.
• Dispose of old coolant properly (most parts stores accept it).

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💰 DIY vs Shop Cost

Shop Cost: $250-$550 (parts + labor)

DIY Cost: $40-$160 (parts only)

You Save: $90-$510 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-2.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.