🔧 Radiator Hose - Replacement

On your Malibu, the radiator hoses carry coolant between the radiator and the engine. Replacing a leaking, swollen, or cracked hose helps prevent overheating and engine damage. You’ll remove the old hose, install the new one with good clamps, then refill and bleed the cooling system.

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

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant cap on a hot engine; hot coolant can spray and burn.
• ⚠️ Support the car with jack stands before going underneath (never rely on a jack alone).
• ⚠️ Keep coolant off belts and electrical connectors; wipe spills right away.
• ⚠️ Coolant is toxic to people and pets; catch it in a drain pan and dispose properly.
• ⚠️ Battery disconnect is not required for this job.

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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 2-gallon)
• Hose clamp pliers (specialty)
• Slip-joint pliers
• Pick tool set (specialty)
• Flathead screwdriver
• 7mm socket
• 8mm socket
• 1/4" ratchet
• 3" extension (1/4" drive)
• Funnel
• Shop rags
• 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 clamp set - Qty: 1
• Dex-Cool coolant (premix 50/50) - Qty: 2-3 gallons

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📋 Before You Begin

• 🧰 Park on level ground, set the parking brake, and chock the rear wheels.
• 🧰 Let the engine cool completely (at least 2 hours).
• 🧰 Place a drain pan under the radiator area before loosening any hose.
• 🧰 If you’re replacing 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 pressure from the cooling system

• With the engine fully cool, place a rag over the coolant reservoir cap.
• Slowly loosen the cap by hand to release any leftover pressure, then remove it.

Step 2: Drain enough coolant to get below hose level

• Position the drain pan (at least 2-gallon) under the radiator lower area.
• If your radiator has a drain valve you can reach, loosen it using a flathead screwdriver (some are hand-turn; use gentle force).
• If you can’t access a drain valve easily, you can drain by loosening the lower hose (Step 5) and controlling the flow into the pan.
• Only drain what you need to reduce spillage.

Step 3: Locate the hose you’re replacing

• Upper hose: runs from the top of the radiator to the thermostat housing at the engine.
• Lower hose: runs from the bottom of the radiator to the water pump inlet area.
• Use a flashlight to identify both clamp ends.

Step 4: Release the clamp(s)

• If you have spring clamps, squeeze and slide them back using hose clamp pliers (specialty).
• If you have worm-gear (screw) clamps, loosen them using an 8mm socket with a 1/4" ratchet (or flathead screwdriver).
• Slide the clamp away from the hose end so it’s not gripping the fitting.

Step 5: Remove the old hose

• Twist the hose back and forth by hand to break it free.
• If it’s stuck, carefully work a pick tool set (specialty) under the hose edge to loosen it. A pick tool is a small hooked tool used to separate stuck rubber from a metal fitting.
• Pull the hose off the fitting while aiming it into the drain pan (at least 2-gallon).
• Use shop rags to wipe coolant off nearby parts.

Step 6: Prep the fittings and compare parts

• Wipe both hose connection fittings clean using shop rags.
• Confirm the new hose matches the old one in length, shape, and end diameter.
• Install new clamps onto the new hose before pushing it onto the fittings.

Step 7: Install the new hose

• Push the new hose fully onto the fitting until it seats against the stop bead (you should feel it “bottom out”).
• Position the clamp about 1/4" behind the hose end (right over the fitting bead area).
• For spring clamps, position using hose clamp pliers (specialty).
• For worm-gear clamps, tighten using an 8mm socket and 1/4" ratchet until snug. Do not crush the hose.

Step 8: Refill coolant

• Make sure the drain valve (if used) is closed using a flathead screwdriver (snug only).
• Slowly refill the reservoir using a funnel and Dex-Cool coolant (premix 50/50).
• Fill to the “FULL COLD” line.

Step 9: Bleed air and warm up

• Set the cabin heat to HOT and fan to low.
• Start the engine and let it idle.
• Watch the coolant level; add as needed with the funnel.
• As the engine warms up, squeeze the upper hose carefully (gloved hand) to help move trapped air.
• When the radiator fan cycles and you get steady heat from the vents, install the reservoir cap by hand.
• Keep fingers away from fans and belts.

Step 10: Check for leaks

• With the engine running, inspect both ends of the replaced hose using a flashlight.
• If you see seepage, shut the engine off and adjust the clamp position/tightness using hose clamp pliers (specialty) or an 8mm socket.

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✅ After Repair

• 🧪 After the engine fully cools, recheck the reservoir level and top off to “FULL COLD” using Dex-Cool coolant (premix 50/50).
• 🧪 Inspect for dried coolant residue around clamps over the next 2-3 drives.
• 🧪 Watch the temperature gauge; if it runs hot or heat output is weak, you may still have air trapped—let it cool and repeat the bleed/warm-up step.
• 🧪 Dispose of old coolant properly.

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💰 DIY vs Shop Cost

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

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

You Save: $160-$310 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.