🔧 RAV4 - Radiator Hose Replacement

Replacing a radiator hose fixes coolant leaks and prevents overheating from a weak, swollen, or cracked hose. The job is straightforward, but you must work with the engine fully cold and refill/bleed the cooling system correctly.

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

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⚠️ Safety & Precautions

• ⚠️ Only work on a fully cold engine; hot coolant can cause severe burns.
• ⚠️ Keep coolant off skin/paint and away from kids/pets; it’s toxic.
• ⚠️ Support the front with jack stands if you go underneath; never rely on a jack.
• ⚠️ Do not open the radiator cap if the upper hose is hot or pressurized.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Wheel chocks
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Drain pan (at least 10-quart)
• Funnel
• Shop towels
• 10mm socket
• Ratchet
• 6-inch extension
• Trim clip removal tool
• Hose clamp pliers
• Slip-joint pliers
• Flathead screwdriver
• Plastic hose pick (specialty)
• Flashlight

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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
• Toyota Super Long Life Coolant (pink, premixed 50/50) - Qty: 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 sit until it’s completely cold (best: overnight).
• If you’re doing the lower hose, raise the front using a floor jack and support it with jack stands.
• Place a drain pan under the radiator drain area before loosening anything.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Identify which hose you’re replacing

• The upper radiator hose runs from the top of the radiator to the engine (thermostat housing area).
• The lower radiator hose runs from the bottom of the radiator down to the engine.
• If one failed, inspect the other closely.

Step 2: Remove the lower engine cover (if equipped)

• Use a 10mm socket with a ratchet and extension to remove the bolts.
• Use a trim clip removal tool to pop out any plastic clips.
• Set the cover and hardware aside in a small pile so nothing gets lost.

Step 3: Relieve pressure and drain coolant to below hose level

• Put on nitrile gloves and safety glasses.
• Slowly loosen the radiator cap (if it has one) with your hand. If you hear pressure, stop and wait longer for it to cool.
• Position the drain pan under the radiator.
• Open the radiator drain cock (petcock) by hand (or use a flathead screwdriver only if needed).
• Drain until the coolant level is below the hose you’re replacing, then close the drain cock by hand. No torque spec—tighten by hand only.

Step 4: Remove the old hose clamps

• For OEM spring clamps: use hose clamp pliers to squeeze the clamp tabs, then slide the clamp back on the hose.
• For screw-type clamps: use a flathead screwdriver to loosen the clamp and slide it back.
• Take a quick photo of clamp positions.

Step 5: Remove the old radiator hose

• Twist the hose by hand to break it loose from the radiator/engine neck.
• If it’s stuck, carefully work around the hose end using a plastic hose pick (specialty) (a small plastic hook tool that helps separate the hose without gouging metal/plastic).
• Pull the hose off and aim it into the drain pan to catch leftover coolant.

Step 6: Prep the fittings (radiator neck and engine neck)

• Use shop towels to wipe the necks clean.
• Inspect for cracks (especially on plastic radiator necks) using a flashlight.
• If you find a cracked neck, stop—replacing the hose won’t fix the leak.

Step 7: Install the new hose and clamps

• Slide the clamps onto the new hose first.
• Push the hose fully onto each neck until it bottoms out (you should feel it “seat”).
• Position each clamp near the end of the hose, behind the raised bead on the neck.
• Spring clamps: reinstall using hose clamp pliers. No torque spec—spring tension sets the clamp load.
• Screw clamps: tighten with a flathead screwdriver until snug. No OEM torque spec—do not overtighten.

Step 8: Reinstall the lower engine cover (if removed)

• Reinstall the cover using the 10mm socket with a ratchet and extension.
• Reinstall plastic clips using the trim clip removal tool to align, then press in by hand.

Step 9: Refill coolant

• Insert a funnel at the radiator fill neck (or reservoir fill, depending on your setup).
• Pour in Toyota Super Long Life Coolant (pink, premixed) slowly.
• Fill to the top, and fill the overflow reservoir to the “FULL” line.

Step 10: Bleed air and verify normal operating temperature

• Start the engine and set the heater to HOT (this helps move coolant through the heater core).
• Let it idle while watching the coolant level; add coolant as the level drops using the funnel.
• Gently squeeze the upper hose a few times (with gloves on) to help burp air.
• When the engine warms up, you should feel the upper hose get hot as the thermostat opens.
• Once bubbling calms down and the level stabilizes, reinstall the radiator cap by hand.

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✅ After Repair

• Check for leaks at both ends of the hose with a flashlight while the engine is running.
• Take a short drive, then recheck for leaks and confirm the temperature gauge stays normal.
• After it fully cools again, recheck the reservoir level and top off if needed.
• Dispose of old coolant properly (do not pour it on the ground).

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💰 DIY vs Shop Cost

Shop Cost: $200-$450 (parts + labor)

DIY Cost: $30-$90 (parts only)

You Save: $170-$360 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.

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Quick check (answer if you can): Are you replacing the upper hose, the lower hose, or both? And is your leak at the hose end/clamp, or does it look like it’s coming from the radiator neck?