🔧 Pilot - Radiator Hose Replacement

On your Pilot, a radiator hose carries coolant between the engine and radiator. Replacing a swollen, cracked, or leaking hose prevents overheating and coolant loss.

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

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⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap hot; coolant can spray and burn.
• ⚠️ Support the Pilot with jack stands before going underneath; never rely on a floor jack.
• ⚠️ Keep coolant away from kids/pets; it’s poisonous and attractive-tasting.
• ⚠️ Wear gloves and safety glasses; coolant and spring clamps can snap loose.
• 🔋 Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Drain pan (at least 10-quart)
• Hose clamp pliers (specialty)
• Tongue-and-groove pliers
• Pick tool (90-degree)
• Trim clip remover
• 10mm socket
• 3/8" ratchet
• 3" extension
• Flat-blade screwdriver
• Funnel
• Shop towels

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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
• Hose clamps - Qty: 2-4
• Honda Type 2 coolant (premixed) - Qty: 1-2 gallons

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Let the engine cool completely (best: sit overnight).
• Decide which hose you’re replacing:
  • Upper hose = top of radiator to engine (usually accessible from above).
  • Lower hose = bottom of radiator to engine (usually easier from below).
• Tip: Take a photo before removing anything.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve cooling system pressure (cold engine only)

• Use your hand to slowly loosen the radiator cap one click to release any remaining pressure, then remove it.
• If the Pilot has a plastic radiator cap cover/duct in the way, remove clips using a trim clip remover.

Step 2: Drain coolant to below hose level

• Place a drain pan (at least 10-quart) under the radiator.
• Open the radiator drain (petcock) by hand; if tight, use a flat-blade screwdriver carefully.
• Drain enough coolant so the level is below the hose you’re replacing, then close the drain.

Step 3: If doing the lower hose, raise the front for access

• Lift the front using a floor jack (rated 3-ton minimum) at the front jacking point.
• Set it down securely on jack stands (rated 3-ton minimum).
• If an under-cover/splash shield blocks access, remove fasteners using a 10mm socket, 3/8" ratchet, and trim clip remover.

Step 4: Remove the old hose clamps

• Most factory clamps are spring clamps (they squeeze to open).
• Use hose clamp pliers (specialty) to squeeze the clamp tabs, then slide the clamp back onto the hose.
• If space is tight, use tongue-and-groove pliers instead.

Step 5: Break the hose loose and remove it

• Twist the hose by hand to break it free.
• If it’s stuck, gently work around the hose end using a pick tool (90-degree) between the hose and the fitting to release it.
• Pull the hose off and aim it into the drain pan (at least 10-quart) for any remaining coolant.
• Tip: Don’t gouge the plastic radiator neck.

Step 6: Prep the fittings

• Wipe the radiator neck and engine-side fitting clean using shop towels.
• Remove any stuck rubber bits with the pick tool (90-degree), then wipe clean again.

Step 7: Install the new hose and clamps

• Slide the new clamp(s) onto the new hose before installing the hose.
• Push the new hose fully onto the fittings until it bottoms out.
• Position the clamp behind the raised “bead” on the fitting (the bead helps prevent leaks).
• Use hose clamp pliers (specialty) or tongue-and-groove pliers to set the clamps in place.

Step 8: Reinstall any removed covers/ducting

• Reinstall splash shield/under-cover fasteners using a 10mm socket, 3/8" ratchet, and trim clip remover.
• Lower the Pilot safely using the floor jack (rated 3-ton minimum).

Step 9: Refill coolant

• Use a funnel to refill the radiator with Honda Type 2 coolant (premixed).
• Fill the coolant reservoir to the MAX line with Honda Type 2 coolant (premixed).

Step 10: Bleed air and verify operation

• Set the HVAC to HOT and the fan to LOW.
• Start the engine and let it idle with the radiator cap off until the thermostat opens (upper hose gets hot).
• Watch for air bubbles at the radiator fill neck; top off as needed using Honda Type 2 coolant (premixed) and a funnel.
• Once bubbles stop and the level stabilizes, install the radiator cap.
• Let the engine continue running until the cooling fans cycle on and off at least once.
• Shut off the engine and check for leaks at both ends of the hose using a light and shop towels.

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✅ After Repair

• After the first full heat cycle and cool-down, recheck the reservoir level and top off to MAX if needed.
• Inspect for seepage around the clamps for the next few drives.
• If you see overheating, no cabin heat, or repeated coolant loss, stop driving and recheck for trapped air or a loose clamp.

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💰 DIY vs Shop Cost

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

DIY Cost: $60-$180 (parts only)

You Save: $190-$370 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?

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