🔧 Suburban - Radiator Hose Replacement

Replacing a radiator hose stops coolant leaks and prevents overheating. On your Suburban, the most common are the upper radiator hose (engine to radiator top) and lower radiator hose (radiator bottom to water pump).

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 Suburban with jack stands if you lift it; never rely on a jack alone.
• ⚠️ Keep coolant off belts and electrical connectors; wipe spills immediately.
• ⚠️ Dispose of old coolant properly; it’s toxic to people and pets.
• ⚠️ 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 4-gallon)
• Hose clamp pliers (specialty)
• Channel-lock pliers
• Pick tool (small hook) (specialty)
• Flat-blade screwdriver
• 1/4" drive ratchet
• 8mm socket
• 10mm socket
• Funnel
• Shop rags

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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 clamps - Qty: 2
• DEX-COOL coolant (50/50 premix) - Qty: 2-3 gallons

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📋 Before You Begin

• 🧊 Let the engine cool completely (best: sit overnight).
• 🅿️ Park on level ground, set the parking brake, and chock the rear wheels.
• 🧻 Lay rags under the hose area to catch drips.
• 🔥 When refilling later, set HVAC to heat: Front climate temp to HI (helps purge air).
• Hose clamp pliers are pliers that lock and hold spring clamps open for you.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Verify which hose you’re replacing

• Use a flashlight and your eyes: the upper hose goes to the radiator top; the lower hose goes to the radiator bottom.
• Check for wetness, crusty residue, or swelling near the ends.

Step 2: Relieve pressure safely

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

Step 3: Drain enough coolant to get below the hose level

• Place a drain pan (at least 4-gallon) under the radiator area.
• If accessible, open the radiator drain (petcock) using a flat-blade screwdriver and drain 1–2 gallons.
• If the petcock isn’t easy to reach, you can drain from the lower radiator hose instead (expect more spill).
• Drain only what you need.

Step 4: Remove the engine cover (if equipped)

• Remove any cover fasteners using a 10mm socket and 1/4" drive ratchet, then lift the cover off.

Step 5: Remove the hose clamps

• For spring-style clamps: use hose clamp pliers (specialty) to squeeze the clamp tabs, then slide the clamp back on the hose.
• For worm-gear clamps (screw type): loosen with an 8mm socket and 1/4" drive ratchet, then slide the clamp back.

Step 6: Break the hose loose (don’t pry on plastic necks)

• Twist the hose by hand to break the seal.
• If it’s stuck, carefully slide a pick tool (small hook) (specialty) under the hose end to let air in, then twist again.
• Pull the hose straight off.

Step 7: Clean and inspect the hose connections

• Wipe the radiator neck and engine/water pump neck using shop rags.
• Do not sand aggressively—just remove crust so the new hose can seal.
• Inspect the necks for cracks (especially plastic ends). If cracked, stop—parts must be replaced before refilling.

Step 8: Install the new hose

• Match the new hose shape to the old one before installing.
• Push the hose on fully until it seats against the stop bead on the neck.
• Position the clamps in the same spot as factory (behind the bead), then release/tighten them:
• If worm-gear clamp: tighten with an 8mm socket and 1/4" drive ratchet until snug (do not crush the neck).
• Clamp behind the bead prevents blow-offs.

Step 9: Refill coolant

• Close the drain (petcock) using a flat-blade screwdriver (snug only).
• Refill the surge tank using a funnel with DEX-COOL coolant (50/50 premix) to the COLD line.

Step 10: Bleed air and check for leaks

• Start the engine and let it idle with the surge tank cap off for a few minutes.
• Set HVAC to heat and fan medium; watch for warm air from vents.
• As the engine warms up, add coolant as the level drops (use a funnel).
• Once stable and no big bubbles, install the cap hand-tight.
• Inspect the hose ends for seepage with a bright light and shop rags.

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✅ After Repair

• 🧪 Test drive 10–15 minutes, then re-check for leaks at both ends of the hose.
• 🌡️ After the engine cools fully, re-check surge tank level and top off to the COLD line.
• 🧼 Rinse any spilled coolant off components with water and wipe dry.

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💰 DIY vs Shop Cost

Shop Cost: $250-$550 (parts + labor)

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

You Save: $210-$410 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.