🔧 RDX - Radiator Hose Replacement

Replacing a radiator hose stops coolant leaks and prevents overheating. You’ll drain some coolant, remove the old hose and clamps, install the new hose, then refill and bleed air from the cooling system.

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

Assumption: You’re replacing either 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 vehicle with jack stands if you go underneath; never rely on a jack alone.
• ⚠️ Coolant is toxic—keep it away from kids/pets and clean spills immediately.
• ⚠️ Wear gloves and safety glasses; spring clamps can snap back.
• 🔋 Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Nitrile gloves
• Safety glasses
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Drain pan (at least 2-gallon)
• Funnel
• Shop rags
• 10mm socket
• 3/8" drive ratchet
• 6" extension (3/8" drive)
• Flathead screwdriver
• Slip-joint pliers
• Hose clamp pliers (specialty)
• Pick tool (small hook) (specialty)
• Torque wrench (5–30 Nm range)

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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
• Engine coolant (Honda/Acura Type 2 premix) - Qty: 1-2 gallons

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📋 Before You Begin

• Park on level ground, set the parking brake, and install wheel chocks.
• Let the engine cool fully (preferably 2+ hours).
• Set the HVAC to HOT later during bleeding (this opens the heater core to purge air).
• If doing the lower hose, raise the front and set it securely on jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve pressure safely

• Put on nitrile gloves and safety glasses.
• Place a shop rag over the radiator cap and slowly loosen it to the first stop to release any remaining pressure, then remove it fully.

Step 2: Drain coolant to below hose level

• Slide a drain pan under the radiator drain area.
• Open the radiator drain (petcock) carefully (often hand-turn; use slip-joint pliers only if needed).
• Drain until the coolant level is below the hose you’re replacing, then close the drain snugly by hand.
• Save clean coolant only if it’s fresh.

Step 3 (Upper hose): Remove components for access

• Remove the plastic engine cover (if equipped) by lifting it up firmly by hand.
• If the air intake duct blocks access, loosen its clamps with a flathead screwdriver and move the duct aside.

Step 4 (Lower hose): Remove lower splash shield for access

• Raise the front with a floor jack (rated 2-ton minimum) and support with jack stands (rated 2-ton minimum).
• Remove the lower engine splash shield fasteners using a 10mm socket, 3/8" drive ratchet, and 6" extension.
• Reinstall torque for 10mm bolts (typical Honda/Acura undercovers): Torque to 9 Nm (80 in-lbs).

Step 5: Remove the old hose clamps

• Use hose clamp pliers (specialty) to compress the spring clamp and slide it back onto the hose. (Hose clamp pliers lock the clamp open so your hands are free.)
• If you have screw-type clamps, loosen them with a flathead screwdriver instead.

Step 6: Remove the old radiator hose

• Twist the hose near the fitting to break it free.
• If it’s stuck, carefully work a pick tool (small hook) (specialty) under the hose end to break the seal, then twist and pull off. (A pick is a small hook tool that helps separate stuck rubber.)
• Catch any extra coolant in the drain pan.
• Do not pry hard on plastic radiator necks.

Step 7: Prep the fittings and compare parts

• Wipe the radiator/engine fittings clean with shop rags.
• Confirm the new hose shape and length matches the old one.
• Slide the new clamps onto the new hose before installing.

Step 8: Install the new radiator hose

• Push the hose fully onto each fitting until it seats against the stop bead.
• Position the clamps behind the bead on the fitting (not on the very edge).
• Release spring clamps using hose clamp pliers (specialty), or tighten screw clamps with a flathead screwdriver until snug (do not strip).

Step 9: Reassemble removed parts

• Reinstall the intake duct and tighten clamps with a flathead screwdriver.
• Reinstall the splash shield (if removed) using a 10mm socket and torque wrench: Torque to 9 Nm (80 in-lbs).
• Lower the vehicle from jack stands using the floor jack.

Step 10: Refill coolant

• Insert a funnel at the radiator fill neck.
• Fill with Honda/Acura Type 2 premix coolant until full.
• Fill the overflow reservoir to the MAX line.

Step 11: Bleed air from the cooling system

• Start the engine and set the heater to HOT and fan to medium.
• Let it idle until warm. Watch the coolant level at the radiator neck and add as it drops using the funnel.
• When the radiator fan cycles on/off at least once, top off and install the radiator cap.
• If your A/C line or thermostat housing has a bleed bolt, open it carefully with a 10mm socket just until air stops and coolant flows, then tighten: Torque to 10 Nm (7 ft-lbs).
• Small bubbles are normal at first.

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✅ After Repair

• With the engine running, inspect both hose ends for leaks using a flashlight and safety glasses.
• Take a short 10–15 minute drive, then recheck the overflow reservoir level after the engine cools; top off to MAX if needed.
• Confirm the cabin heater blows hot and the temperature gauge stays normal.
• Dispose of used coolant properly (sealed container; approved recycling/collection point).

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💰 DIY vs Shop Cost

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

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

You Save: $110-$460 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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