🔧 MDX - Radiator Hose Replacement

Replacing a radiator hose fixes coolant leaks and prevents overheating. On your MDX there are typically two main radiator hoses: the upper hose (radiator to engine) and the lower hose (radiator to engine/water pump area).

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

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⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap on a hot engine; coolant can spray and burn you.
• ⚠️ Support the MDX with jack stands if you lift it; never rely on a jack.
• ⚠️ Keep coolant off belts and electrical connectors; wipe spills immediately.
• ⚠️ Coolant is toxic—use a drain pan and keep away from kids/pets.
• Battery disconnect is not required for this repair.

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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
• Channel-lock pliers
• Pick tool (hook pick)
• Trim clip removal tool
• Phillips screwdriver
• Flathead screwdriver
• 10mm socket
• 12mm socket
• 3/8" drive ratchet
• 3/8" drive extension (6")
• Torque wrench (3/8" drive)
• Funnel with long neck
• 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
• Engine coolant (Honda/Acura Type 2, premixed) - Qty: 2-4 quarts

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📋 Before You Begin

• Park on level ground, set the parking brake, and let the engine cool completely (ideally overnight).
• Set the HVAC to HI heat (this helps coolant flow through the heater core during bleeding).
• If you need more room for the lower hose, raise the front and support with jack stands.
• Place a drain pan under the radiator hose area to catch coolant.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the radiator cap (only when cold)

• Use your hand to slowly loosen the radiator cap to the first stop to release any leftover pressure, then remove it fully.
• If your MDX uses a cap on the coolant reservoir only, remove the reservoir cap instead.

Step 2: Make access (upper hose vs lower hose)

• Upper hose: Usually accessible from the top with the hood open.
• Lower hose: Use a floor jack (rated 3-ton minimum) and jack stands (rated 3-ton minimum) for access from below; use a trim clip removal tool, 10mm socket, and Phillips screwdriver to remove any lower splash shield panels blocking access.

Step 3: Slide the hose clamps back

• Use hose clamp pliers to compress the clamp and slide it 2-3 inches back on the hose.
• If the clamp is a worm-gear style, loosen it with a flathead screwdriver (or 8mm socket if applicable).
• Clamp ears are sharp; wear gloves.

Step 4: Break the hose free (don’t yank)

• Twist the hose gently by hand to break the seal.
• If it’s stuck, carefully work around the hose end with a pick tool (hook pick) to let air in between the hose and the fitting.
• Use channel-lock pliers only on the hose end if needed, and squeeze lightly (you don’t want to crush the radiator neck).

Step 5: Remove the hose and catch coolant

• Pull the hose off the radiator end first and aim it into the drain pan (at least 10-quart).
• Remove the hose from the engine-side fitting and let coolant drain.
• Use shop towels to wipe any spills.

Step 6: Inspect the fittings and clean the sealing surfaces

• Check the radiator neck and engine-side pipe for cracks, heavy corrosion, or deep pitting.
• Use shop towels to clean the sealing area until it’s smooth and dry.

Step 7: Install the new hose and position the clamps

• Slide the clamps onto the new hose first (use hose clamp pliers).
• Push the hose fully onto each fitting until it bottoms out.
• Position each clamp behind the raised “bead” on the fitting, then release/tighten it.
• Torque to: If using worm-gear clamps, tighten with a flathead screwdriver until snug and the hose cannot rotate by hand (hose clamps typically do not have a factory torque spec).

Step 8: Reinstall any splash shields (lower hose)

• Use a 10mm socket, Phillips screwdriver, and trim clip removal tool to reinstall the underbody panel(s).

Step 9: Refill coolant

• Insert a funnel with long neck into the radiator fill neck (or reservoir if that is the fill point).
• Add Honda/Acura Type 2 premixed coolant until full.
• Fill the overflow reservoir to the MAX line.

Step 10: Bleed air from the cooling system

• Start the engine and let it idle with the radiator cap off (or reservoir cap off if that’s the fill point).
• Turn the heater to HI and fan to a medium setting.
• Watch for air bubbles and the coolant level dropping; keep topping up using the funnel with long neck.
• Once the radiator fan cycles on and off and bubbles slow down, reinstall the cap by hand.
• Don’t rev hard; idle is safer for bleeding.

Step 11: Final checks for leaks

• With the engine warm, inspect both hose ends using safety glasses and a light.
• Look for seepage around the clamp areas and check for coolant smell or drips under the MDX.

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✅ After Repair

• Let the engine cool completely, then recheck the coolant level in the reservoir and top off if needed.
• Take a 10-15 minute test drive while monitoring the temperature gauge.
• Recheck for leaks after the drive and again the next morning.
• If the temperature rises, the heater blows cold, or you hear gurgling, shut it off and re-bleed (air is still trapped).

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💰 DIY vs Shop Cost

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

DIY Cost: $40-$140 (parts only)

You Save: $210-$410 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.