Assumption: This guide covers replacing a main radiator hose on your Sierra, with notes for upper or lower hose where the procedure differs.

🔧 Radiator Hose - Replacement

The radiator hose carries coolant between the engine and radiator. A cracked, swollen, or leaking hose can cause overheating fast, so replacement is important as soon as you see seepage or softness.

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

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⚠️ Safety & Precautions

• Let the engine go completely cold before opening the cooling system.
• Hot coolant can spray out under pressure and cause serious burns.
• Use only the correct Dex-Cool coolant mixture for this Sierra.
• Keep the coolant reservoir cap loose only after 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:

• Drain pan
• Flat blade screwdriver
• Hose clamp pliers
• 10mm socket
• Ratchet
• Extension
• Pliers
• Funnel
• Safety glasses
• 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:

• Radiator hose - Qty: 1
• Radiator hose clamps - Qty: 2
• Dex-Cool coolant - Qty: 1-2 gallons
• Distilled water - Qty: 1-2 gallons
• Replacement hose spring clip or retaining clip - Qty: 1, if equipped

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Raise the front of the truck only if you need more room under it.
• Place a drain pan under the radiator before opening any hose connection.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove pressure from the cooling system

• With the engine cold, slowly loosen the coolant reservoir cap to release any leftover pressure.
• If the cap is stuck, stop and let the system sit longer.

Step 2: Drain coolant below the hose level

• Use a drain pan under the radiator.
• If equipped with a radiator drain, open it carefully.
• If not, remove the lower hose first and let coolant drain into the pan.
• Catch as much coolant as possible for reuse if it is clean.

Step 3: Remove the old hose clamps

• Use hose clamp pliers or a flat blade screwdriver, depending on clamp style.
• Slide spring clamps back on the hose.
• If yours uses screw clamps, loosen them with a screwdriver or 8mm nut driver if needed.

Step 4: Remove the old radiator hose

• Use pliers to gently twist the hose loose at each end.
• Pull the hose off the radiator neck and engine fitting.
• If it is stuck, carefully work it free with a flat blade screwdriver under the hose edge.
• Do not damage the plastic radiator neck or metal tube.

Step 5: Compare and install the new hose

• Compare the new hose to the old one for length and bend shape.
• Transfer any clips or sleeves from the old hose if the new one does not include them.
• Install new clamps onto the hose before pushing it on.
• Push the hose fully onto both fittings until it seats against the stop.

Step 6: Position and secure the clamps

• Use hose clamp pliers to place the clamps over the hose nipples.
• Position them behind the raised bead on each fitting.
• Make sure the clamp sits flat and even.
• Torque to 3-5 Nm (27-44 in-lbs) if using worm-gear style clamps.

Step 7: Refill the cooling system

• Use a funnel to fill the reservoir with the correct Dex-Cool coolant mix.
• Top off to the proper mark.
• Check for spills around the hose ends.

Step 8: Bleed air from the system

• Start the engine with the cap off if the reservoir design allows it.
• Set the heater to hot and the blower on low.
• Let the engine reach operating temperature.
• Watch for bubbles in the reservoir and add coolant as the level drops.
• Install the cap once the level stabilizes.
• Air pockets can cause overheating.

Step 9: Inspect for leaks

• Use a flashlight to check both hose ends and clamp areas.
• Look for seepage after the engine reaches temperature.
• Shut the engine off and recheck after a short cool-down.

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✅ After Repair

• Drive the Sierra for a short test route.
• Watch the temperature gauge closely.
• Recheck coolant level after the engine cools again.
• Inspect the hose and clamps for fresh leaks over the next few trips.

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💰 DIY vs Shop Cost

Shop Cost: $180-$380 (parts + labor)

DIY Cost: $35-$110 (parts only)

You Save: $145-$270 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?

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