Silverado 1500 - Radiator Hose Replacement 🚚

Since you didn’t specify, I’ll cover both upper and lower radiator hoses on your Silverado. You can do just the one you need and skip the other section.

Safety & Prep ⚠️

• 🧤 Only work on a cold engine. Hot coolant can cause serious burns.
• 🧯 Park on level ground, set the parking brake, and chock a rear wheel.
• 🔌 If you’ll be leaning in a lot, you can disconnect the negative battery cable for safety (10 mm wrench).

Parts You’ll Need 📦

• 🧩 Upper radiator hose (radiator to engine)
• 🧩 Lower radiator hose (radiator to water pump/engine)
• 🧩 New hose clamps (if your new hoses don’t come with them; use constant-tension or worm-gear clamps sized for the hose)
• 🧴 Dex-Cool coolant (orange) premixed 50/50, or concentrate plus distilled water
  • Capacity for your V6 is roughly 4–5 gallons total, but you’ll usually lose 2–3 gallons doing hoses.
• 🧼 Shop towels / rags and a drain pan (at least 3–4 gallon capacity)

Tools You’ll Need 🛠️

• 🧰 Socket set (metric) and ratchet – mainly 10 mm for covers and shields
• 🧰 Flat-blade screwdriver – for worm-gear clamps and gently prying hoses
• 🧰 Hose clamp pliers (special pliers that grab spring clamps) – makes spring clamps much easier
• 🧰 Pliers – if you don’t have clamp pliers, regular slip-joint pliers can work on spring clamps
• 🧰 Utility knife or hose pick tool – to carefully break stuck hoses loose (don’t cut into the metal neck)
• 🧰 Funnel – for refilling coolant

Coolant Drain – Before Any Hose Removal 💧

This step is the same whether you’re doing upper, lower, or both hoses.

• 🧊 Make sure the engine is completely cool.
• 🧵 Remove the coolant reservoir cap (on the plastic tank near the radiator) to release any residual pressure.
• 🪜 Place your drain pan under the radiator drain petcock:
  • On your Silverado, it’s at the bottom of the radiator, usually on the passenger side, facing rearward.
• 🔧 Open the petcock by hand or with pliers (turn counterclockwise gently) and let coolant drain until it slows to a drip.
• 🔧 Close the petcock snugly (do not overtighten; it’s plastic).

Upper Radiator Hose – Removal 🧱

The upper hose runs from the top of the radiator (driver side) to the engine near the thermostat housing.

• 🧰 If needed, remove any plastic engine cover (usually 10 mm bolts or just pulls off).
• 📍 Locate the upper radiator hose:
  • One end at the top of the radiator.
  • Other end at the engine/thermostat housing.
• 🔧 At the radiator end:
  • If it has a spring clamp: squeeze the tabs with pliers or hose clamp pliers and slide the clamp back along the hose.
  • If it has a worm-gear clamp: loosen with a flat screwdriver or 8 mm socket and slide it back.
• 🔧 Repeat for the engine end clamp.
• 🪚 Twist the hose gently to break it free:
  • If it’s stuck, use a hose pick or carefully slide a flat screwdriver under the hose lip to break the seal.
  • Do not gouge the aluminum or plastic neck.
• 🪣 Remove the hose and let any remaining coolant drain into the pan.

Upper Radiator Hose – Installation 🔩

• 🧴 Wipe the radiator and engine necks clean with a rag. Remove any old rubber or corrosion.
• 🧴 Lightly wet the inside of the new hose ends with a bit of fresh coolant to help them slide on.
• 📍 Slide the new clamps onto the hose first (one on each end).
• 🔧 Install the hose:
  • Match the shape/orientation of the old hose so it doesn’t rub on anything.
  • Push each end fully onto its neck until it bottoms out against the stop.
• 🔧 Position the clamps just behind the raised bead on the neck and tighten:
  • Spring clamp: release pliers so it clamps down.
  • Worm-gear clamp: tighten snugly; typical torque is about 35–45 in-lb (4–5 N·m) – firm but not crushing.

Lower Radiator Hose – Removal 🧱

The lower hose runs from the bottom of the radiator (usually passenger side) to the water pump/engine area.

• 🧰 Safely raise the front of the truck if needed:
  • Use a floor jack on the front frame crossmember.
  • Support with jack stands under the frame rails. Never rely on the jack alone.
• 🧰 Remove the lower splash shield if it blocks access (usually 10 mm bolts or plastic clips).
• 📍 Locate the lower radiator hose:
  • One end at the bottom of the radiator.
  • Other end at the water pump/engine inlet.
• 🔧 Move the clamps back from both ends (same method as upper hose).
• 🪚 Twist and pull the hose off both ends, catching coolant in the drain pan.
• 🧴 Clean the necks with a rag.

Lower Radiator Hose – Installation 🔩

• 🧴 Lightly wet the inside of the new hose ends with coolant.
• 📍 Slide clamps onto the hose first.
• 🔧 Install the hose, matching the original routing so it doesn’t touch the fan, belts, or sharp edges.
• 🔧 Position and tighten clamps just behind the bead, same torque as upper hose (about 4–5 N·m for worm-gear).
• 🧰 Reinstall the lower splash shield and lower the truck if you raised it.

Refill & Bleed the Cooling System 🌡️

• 🧴 Make sure the radiator drain petcock is closed.
• 🧴 Fill the coolant reservoir with 50/50 Dex-Cool mix up to the COLD mark.
• 🚗 Start the engine and set the heater to HOT with the fan on low.
• ⏱ Let the engine idle and warm up:
  • Watch the temperature gauge; it should rise to normal, not into the red.
  • As the thermostat opens, the level in the reservoir may drop; add coolant as needed to keep it near the COLD/FULL mark.
• 🫧 Gently squeeze the upper radiator hose (with gloves) to help push air out.
• ⏱ After the engine reaches normal temp and the heater blows hot, shut it off and let it cool completely.
• 🧊 Once cool, recheck the coolant level and top off to the COLD mark.

Final Checks ✅

• 👀 Inspect all hose connections for leaks while the engine is running and after it cools.
• 👀 Make sure hoses are not rubbing on fans, belts, or sharp edges.
• 🧪 Properly dispose of old coolant – it’s toxic to animals and the environment.

Torque Specs Summary 📏

• 🔩 Worm-gear hose clamps: about 35–45 in-lb (4–5 N·m) – snug, not crushed.
• 🔩 Splash shield bolts (10 mm): about 80 in-lb (9 N·m) – just firm.

HowToo makes it easy: below this answer you’ll see the correct upper and lower hoses, clamps, coolant, and any tools you’re missing, with same-day/2-day shipping. You can add them to your cart right from the parts section.

If you tell me whether you’re doing just the upper, just the lower, or both, I can trim this down to a very short checklist just for that job. 💡