🔧 Radiator Hose - Replacement

On your Sierra, replacing a radiator hose means draining enough coolant to get the hose off safely, swapping the old hose and clamps, then refilling and bleeding the cooling system. This guide applies to both the upper and lower radiator hose, since the basic steps are very similar.

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

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system. Hot coolant can cause serious burns.
• Use jack stands if you need to reach the lower hose from underneath. Never rely on the jack alone.
• Coolant is toxic. Keep it away from children, pets, and painted surfaces.
• If your truck has a pressurized coolant surge tank cap, remove it only when the engine is cold.
• Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Flat-blade screwdriver
• Hose clamp pliers (specialty)
• Drain pan
• 10mm socket
• Ratchet
• Extension bar
• Floor jack (rated 3-ton minimum)
• Jack stands
• Safety glasses
• Nitrile gloves
• Funnel
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Radiator hose - Qty: 1
• Hose clamps - Qty: 2
• Dex-Cool coolant - Qty: 1-2 gallons

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool all the way down.
• If you are replacing the lower hose, raise the front of the truck with a floor jack and support it with jack stands.
• Place a drain pan under the radiator before opening the cooling system.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve coolant pressure

• With the engine cold, slowly remove the coolant reservoir cap.
• Use your hand only. Do not rush this step.

Step 2: Drain coolant below the hose level

• Place the drain pan under the radiator drain area.
• If your truck has a drain petcock, open it with a flat-blade screwdriver and drain enough coolant so the hose can be removed without spilling everywhere.
• If needed, remove the lower splash shield with a 10mm socket and ratchet.

Step 3: Remove the old hose

• Use hose clamp pliers to compress the spring clamps and slide them back on the hose.
• Twist the hose gently by hand to break it loose from the radiator and engine connection.
• Pull the hose off the fittings.
• Twist first, then pull.

Step 4: Clean the hose connections

• Use a clean shop towel to wipe the radiator neck and engine fitting.
• Make sure there is no old rubber stuck on the metal or plastic fittings.
• If the fitting is damaged or cracked, stop and repair that first.

Step 5: Install the new hose

• Slide the new clamps onto the hose before pushing it into place.
• Push the hose fully onto the radiator and engine fittings until it seats completely.
• Position the clamps in the same spot as the originals.
• If you are using spring clamps, use hose clamp pliers to move them into place.
• Make sure the hose is fully seated.

Step 6: Reassemble the truck

• Reinstall the splash shield if you removed it.
• Lower the truck if it was raised.

Step 7: Refill the cooling system

• Use a funnel to refill with the correct Dex-Cool coolant.
• Fill the reservoir to the proper mark.
• Do not overfill.

Step 8: Bleed the system and check for leaks

• Start the engine and let it idle with the heater set to full hot.
• Watch the coolant level and top it off as the air purges out.
• Check both ends of the hose for leaks.
• Once the engine reaches operating temperature, recheck the coolant level after it cools.

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✅ After Repair

• Drive the truck and watch the temperature gauge.
• Recheck coolant level the next day when the engine is cold.
• Inspect the hose clamps again for seepage.
• If you see overheating or coolant loss, stop and inspect the system immediately.

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💰 DIY vs Shop Cost

Shop Cost: $180-$420 (parts + labor)

DIY Cost: $40-$120 (parts only)

You Save: $140-$300 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?

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.