🔧 Radiator Hoses - Replacement

Replacing both radiator hoses restores coolant flow and helps prevent leaks, overheating, and hose burst failures. On your Sierra, both the upper and lower hoses should be inspected together and replaced as a set if one has failed, since the rubber ages at a similar rate.

Difficulty Level: Beginner | Estimated Time: 1.5-2.5 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system. Hot coolant can cause severe burns.
• Keep hands clear of the electric fan. It can start automatically when the ignition is on.
• Use eye protection and gloves. Coolant is slippery and irritating.
• Have a drain pan ready. Coolant is toxic to people and animals.
• Do not remove the coolant cap when the system is hot.
• No battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• Ratchet
• Short extension
• Flat-head screwdriver
• Pliers
• Hose clamp pliers (specialty)
• Drain pan
• Funnel
• 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:

• Upper radiator hose - Qty: 1
• Lower radiator hose - Qty: 1
• Coolant (DEX-COOL, premixed 50/50) - Qty: 2 gallons
• Hose clamps - Qty: 4

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📋 Before You Begin

• Park on level ground and let the engine go fully cold.
• Set the parking brake and chock the wheels.
• Tip: Take a quick photo of each hose routing first.
• Place a drain pan under the radiator before removing anything.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Use a drain pan under the radiator drain area.
• Open the radiator drain valve or remove the lower hose slowly to drain coolant into the pan.
• Let enough coolant drain so the level drops below both hose connections.

Step 2: Remove the upper radiator hose

• Use pliers or a hose clamp pliers (specialty) to release the spring clamps.
• Slide the clamps back on the hose.
• Twist the hose gently to break it free, then pull it off the radiator and engine fittings.
• Tip: Twist first, then pull.

Step 3: Remove the lower radiator hose

• Use pliers or a hose clamp pliers (specialty) to release the lower hose clamps.
• Remove the hose from the radiator outlet and engine connection.
• If it is stuck, use a flat-head screwdriver carefully to lift the hose edge loose without damaging the neck.

Step 4: Compare and prep the new hoses

• Match each new hose to the old one before installing.
• Transfer any spring clips, brackets, or anti-chafe sleeves to the new hoses.
• Make sure the clamps are already on the hose before installation.

Step 5: Install the upper radiator hose

• Push the new upper hose fully onto the radiator and engine fittings.
• Position the clamps in the same spot as the originals.
• Use pliers or hose clamp pliers (specialty) to secure the clamps.

Step 6: Install the lower radiator hose

• Install the lower hose onto both ends until fully seated.
• Use pliers or hose clamp pliers (specialty) to move the clamps into position.
• Check that the hose is not twisted and does not rub on nearby parts.

Step 7: Refill the cooling system

• Use a funnel to refill the radiator and reservoir with DEX-COOL, premixed 50/50.
• Fill to the proper level.
• Start the engine and let it idle with the heater on full hot.
• Add coolant as the level drops.

Step 8: Bleed air and check for leaks

• Let the engine reach operating temperature.
• Watch the hose ends, clamps, and drain area for leaks.
• Top off the coolant reservoir after the engine cools again.
• Torque: No torque spec applies to spring hose clamps; seat them fully in the original clamp position.

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✅ After Repair

• Drive the truck and monitor coolant temperature.
• Recheck coolant level after one complete heat cycle.
• Inspect both hose connections again for seepage.
• If the heater output is weak or the temp fluctuates, there may still be air in the system.

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💰 DIY vs Shop Cost

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

DIY Cost: $70-$140 (parts only)

You Save: $180-$360 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 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.