🔧 Odyssey - Radiator Hose Replacement

Replacing a radiator hose means removing the old rubber hose (upper and/or lower) and installing a new one with the clamps positioned correctly. This prevents coolant leaks and overheating caused by aged, swollen, cracked, or soft hoses.

Difficulty Level: Intermediate | Estimated Time: 1-2 hours

Assumption: You may be replacing the upper or lower radiator hose; steps include both.

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⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap on a hot engine; hot coolant can spray and burn you.
• ⚠️ Support the van with jack stands if you lift it; never rely on a floor jack alone.
• ⚠️ Keep coolant off belts and electrical connectors; wipe spills immediately.
• ⚠️ Dispose of old coolant properly; it’s toxic to people and pets.
• 🔋 Battery disconnect is not required for hose replacement.

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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)
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Slip-joint pliers
• Hose clamp pliers (specialty)
• Pick tool
• Flat-blade screwdriver
• 10mm socket
• 3/8" drive ratchet
• 3" extension
• Trim clip removal tool
• Funnel
• Shop towels
• Work light

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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
• Honda Type 2 coolant (premixed 50/50) - Qty: 1-2 gallons

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Let the engine cool completely (best is overnight).
• Set the HVAC to HOT later during bleeding (this helps purge air).
• If you need access to the lower hose, raise the front with a floor jack and support with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Make the system safe to open

• Open the hood and verify the radiator is cool to the touch.
• Place a shop towel over the radiator cap.
• Slowly loosen the cap to the first stop to release any leftover pressure, then remove it fully by hand.

Step 2: Drain enough coolant to get below the hose level

• Slide a drain pan under the radiator.
• If your Odyssey has an engine under-cover, remove the access panel/clips using a trim clip removal tool and 10mm socket.
• Loosen the radiator drain (petcock) using a flat-blade screwdriver and drain 1-2 quarts (you don’t need to fully drain for a hose).
• Close the drain by hand feel until snug. Torque: Not typically specified for the plastic drain; do not overtighten.

Step 3: Remove the upper radiator hose (radiator to engine)

• Locate the upper hose at the top of the radiator.
• Use hose clamp pliers (specialty) (they lock onto spring clamps) or slip-joint pliers to squeeze the clamp ears.
• Slide the clamp back several inches onto the hose.
• Twist the hose to break it loose by hand. If it’s stuck, gently work the edge with a pick tool (do not gouge the plastic radiator neck).
• Pull the hose off the radiator, then off the engine side, aiming it into the drain pan to catch drips.

Step 4: Remove the lower radiator hose (radiator to engine)

• From underneath, use a work light to locate the lower hose at the bottom of the radiator.
• Use hose clamp pliers (specialty) or slip-joint pliers to compress the clamp and slide it back on the hose.
• Twist the hose by hand to free it, then pull it off carefully (more coolant will spill here).
• If access is tight, remove any small splash shield pieces using a 10mm socket and ratchet.

Step 5: Install the new hose(s)

• Compare new vs old hose for length, bends, and end sizes (match exactly).
• Slide the clamp(s) onto the new hose before installing.
• Push the hose fully onto the radiator neck and engine neck until it bottoms out.
• Reposition each clamp to the same spot as original (usually just behind the raised “bead” on the neck).
• Torque: Spring clamps use clamp tension (no torque spec). If using screw clamps, tighten with a flat-blade screwdriver until snug—do not crush the radiator neck.

Step 6: Refill coolant

• Insert a funnel and fill the radiator with Honda Type 2 coolant (premixed 50/50) until full.
• Fill the coolant reservoir to the MAX line.
• Wipe any spills using shop towels.

Step 7: Bleed air from the cooling system

• Leave the radiator cap off for now.
• Start the engine and set HVAC to HOT and fan to medium.
• Let the engine idle and watch the coolant level. Add coolant as it drops using the funnel.
• When the upper hose gets hot, lightly raise engine speed to about 1,500 rpm for 10-15 seconds a few times to help burp air.
• Once bubbles slow down and the level stabilizes, install the radiator cap by hand until fully seated.
• Tip: Never rev a cold engine hard.

Step 8: Reinstall any covers and lower the vehicle

• Reinstall splash shields/under-cover using a 10mm socket and trim clip removal tool.
• Lower the van from jack stands using a floor jack.

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✅ After Repair

• With the engine running, inspect both hose ends for leaks using a work light.
• Road-test 10-15 minutes, then recheck for leaks and confirm the temperature gauge stays normal.
• After the engine cools completely, recheck the reservoir level and top off to MAX if needed.
• If you hear gurgling behind the dash or the heat is weak, there’s likely air trapped—repeat the bleed process.

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💰 DIY vs Shop Cost

Shop Cost: $250-$500 (parts + labor)

DIY Cost: $40-$120 (parts only)

You Save: $210-$380 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-2 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.