🔧 ES350 - Radiator Hose Replacement

Replacing a radiator hose means draining some coolant, removing the old hose and clamps, then installing the new hose and refilling/bleeding the cooling system. This is important because a soft, cracked, or swollen hose can burst and cause overheating.

Difficulty Level: Intermediate | Estimated Time: 1.5-3 hours

Assumption: Steps cover upper and/or lower radiator hose.

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⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap on a hot engine; hot coolant can spray and burn you.
• ⚠️ Support the car with jack stands; never rely on a floor jack alone.
• ⚠️ Coolant is toxic; keep it away from kids/pets and clean spills immediately.
• ⚠️ Use safety glasses; coolant can drip straight down when the hose releases.
• 🔋 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)
• Long-neck funnel
• Pliers (hose clamp pliers preferred)
• Pick tool (small hook pick)
• Trim clip remover
• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• Flathead screwdriver
• Shop rags

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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/Lexus Super Long Life Coolant (pink) premix 50/50 - Qty: 1-2 gallons

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Let the engine cool completely (ideally 2+ hours).
• Set the cabin heat to HI later during bleeding so coolant can flow through the heater core (the small radiator inside the dash that provides heat).
• If you need access from below for the lower hose, raise the front with a floor jack and support with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove covers for access

• Remove the plastic engine cover by pulling it upward firmly by hand (it’s held by rubber grommets).
• If needed for space, loosen intake duct clamps using a flathead screwdriver and remove any intake clips/bolts using a 10mm socket with a 1/4" ratchet.

Step 2: Relieve pressure safely

• Place shop rags around the radiator cap area.
• Slowly loosen the radiator cap only if the engine is fully cool; remove it once you confirm there is no pressure.

Step 3: Drain coolant to below hose level

• Position a drain pan under the radiator.
• Open the radiator drain cock (small plastic drain valve at the bottom of the radiator) by hand; if tight, use a flathead screwdriver carefully.
• Drain until the coolant level is below the hose you’re replacing (usually 1–2 gallons for the lower hose, less for the upper).

Step 4: Remove the old hose clamps

• Use pliers (hose clamp pliers preferred) to squeeze the spring clamp tabs and slide the clamp back onto the hose.
• If you have screw-type clamps, loosen them using a flathead screwdriver.
• Tip: Take a quick photo of clamp positions.

Step 5: Break the hose loose (without damaging the radiator neck)

• Twist the hose gently by hand to break it free from the fitting.
• If it’s stuck, use a pick tool (small hook pick) to carefully lift the hose edge and let coolant seep in—don’t gouge the plastic/metal neck.
• Pull the hose off and aim it into the drain pan because coolant will spill.

Step 6: Remove the hose (upper and/or lower)

• Upper hose: Remove from radiator upper outlet and engine-side outlet using pliers and hand twisting.
• Lower hose: You may need under-car access. Remove any lower splash shield clips using a trim clip remover and 10mm socket.

Step 7: Prep the fittings and compare parts

• Wipe the radiator/engine hose necks clean using shop rags.
• Compare the new hose to the old one (length, bends, diameter) before installing.
• Slide clamps onto the new hose first (don’t forget this step).

Step 8: Install the new hose

• Push the hose fully onto each fitting until it bottoms out (no gap at the end).
• Position spring clamps in the same “clamp zone” as the factory setup (usually just behind the raised bead on the neck) using pliers.
• If using screw clamps, tighten with a flathead screwdriver until snug—do not crush the radiator neck.

Step 9: Reinstall any removed ducts/shields

• Reinstall the splash shield using a 10mm socket and trim clip remover as needed.
• Reinstall intake ducting and tighten clamps with a flathead screwdriver.
• Reinstall the engine cover by pushing down until it seats.

Step 10: Refill coolant

• Close the radiator drain cock by hand (snug only—plastic).
• Use a long-neck funnel to fill the radiator with Toyota/Lexus Super Long Life Coolant (pink) premix 50/50 until full.
• Fill the coolant reservoir to the FULL line.

Step 11: Bleed air from the cooling system

• Start the engine and set the heater to HI (fan medium).
• Let the engine idle while watching the coolant level in the radiator; add coolant with the funnel as the level drops.
• When the thermostat opens (upper hose gets hot), you may see bubbles; keep topping off until bubbles stop.
• Install the radiator cap once the level stays steady, then let it idle 2–3 more minutes.

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✅ After Repair

• With the engine running, inspect both hose ends for leaks using safety glasses and a flashlight-style view (use good lighting).
• Take a short test drive, then re-check the reservoir level after the engine cools fully; top off to the FULL line.
• Check for dried coolant residue around clamp areas over the next 1–2 days.
• Dispose of old coolant properly (most parts stores accept waste coolant).

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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 1.5-3 hours.

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🎯 Ready to get started?

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