🔧 Radiator Hose - Replacement

Replacing a leaking or swollen radiator hose restores coolant flow and helps prevent overheating. On your Prius V, the hose is part of the engine cooling system, so work cleanly and keep air out of the system when you refill it.

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

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⚠️ Safety & Precautions

• Assumption: this guide covers the upper radiator hose. If you meant the lower hose, the process is similar but access is different.
• Let the engine go completely cold before opening the cooling system. Hot coolant can cause severe burns.
• Hybrid system caution: keep the vehicle OFF, key fob away from the car, and wait at least 5 minutes before working near the engine bay.
• Do not start the engine with tools or hands near the radiator fan area.
• Use eye protection and gloves. Coolant is slippery and toxic.
• Battery disconnect is not usually required for this hose job, but it is a good idea if you will be working near the radiator fan connector or any exposed wiring.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• Ratchet
• Extension bar
• Hose clamp pliers
• Pliers
• Drain pan
• Funnel
• Coolant spill tray
• Trim clip removal tool
• Shop towels
• Safety glasses
• Nitrile gloves
• Jack stands
• Floor jack (rated 3-ton minimum)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Radiator hose - Qty: 1
• Radiator hose clamps - Qty: 2
• Toyota Super Long Life Coolant - Qty: enough to refill system

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Make sure the engine is fully cold.
• Remove the key fob from the vehicle area so the hybrid system does not wake up.
• If the hose is near the radiator fan or splash shield, raise the front safely with a floor jack and support it with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve pressure and drain coolant

• With the engine cold, slowly remove the coolant reservoir cap if needed to relieve any leftover pressure.
• Place a drain pan under the radiator drain area.
• Use a flat-head screwdriver or your fingers, depending on the drain style, to open the drain enough to lower the coolant level below the hose you are replacing.
• Go slow to avoid a coolant mess.

Step 2: Remove access panels if needed

• Use a 10mm socket, ratchet, and extension bar to remove any undercovers or air guides blocking access.
• Use a trim clip removal tool to remove plastic clips without breaking them.

Step 3: Remove the old hose

• Use hose clamp pliers to compress the spring clamps and slide them back on both ends of the hose.
• Twist the hose gently to break it loose, then pull it off the radiator neck and engine pipe.
• If it is stuck, use pliers carefully on the hose end, not on the radiator neck.
• Twist first, then pull.

Step 4: Inspect the fittings

• Check both hose necks for corrosion, cracks, or stuck rubber pieces.
• Wipe the sealing surfaces clean with shop towels.
• If the old clamps are weak or rusty, replace them with the new clamps.

Step 5: Install the new hose

• Slide the new clamps onto the hose before installing it.
• Push the hose fully onto the radiator neck and engine pipe until it seats against the stop.
• Position the clamps over the hose beads using hose clamp pliers.
• Make sure the hose is not twisted or rubbing on nearby parts.

Step 6: Reinstall covers and lower the vehicle

• Reinstall any removed undercovers using the 10mm socket, ratchet, and trim clip removal tool.
• Lower the vehicle carefully if it was raised.

Step 7: Refill and bleed the cooling system

• Use a funnel to refill with the correct Toyota coolant.
• Fill the reservoir to the proper mark.
• Start the vehicle and let it idle while monitoring coolant level.
• Turn the cabin heater to hot and the fan to low so coolant can circulate through the heater core.
• Add coolant as the level drops.
• Torque to hand-tight only for the reservoir cap; do not overtighten plastic caps.

Step 8: Check for leaks

• Inspect both ends of the hose while the engine warms up.
• Look for drips, swelling, or clamp seepage.
• Recheck coolant level after the engine cools back down.

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✅ After Repair

• Test drive the vehicle and watch the temperature gauge or warning lights.
• Recheck the coolant level after the next full cool-down cycle.
• Inspect the hose and clamps again for leaks after a short drive.
• If the engine overheated before the repair, scan for stored coolant temperature codes.

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💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $40-$110 (parts only)

You Save: $180-$340 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?

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