🔧 Suburban - Radiator Hose Replacement

Replacing a radiator hose stops coolant leaks and prevents overheating. On your Suburban, you’ll typically replace the upper hose (radiator to engine) and/or the lower hose (radiator to water pump). Expect some coolant loss, so you’ll drain and refill the cooling system.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant cap on a hot engine; hot coolant can spray and burn you.
• ⚠️ Support the truck with jack stands; never rely on a floor jack alone.
• ⚠️ Keep coolant off the ground; it’s toxic and slippery.
• ⚠️ Keep hands/tools clear of the fan area when running the engine for bleeding.
• 🔋 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 3-gallon)
• Funnel
• 8mm socket
• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• Flat-blade screwdriver
• Hose clamp pliers (specialty)
• Pick tool (specialty)
• Slip-joint pliers
• Trim clip remover (specialty)
• Shop towels
• Flashlight

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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 clamp set - Qty: 1
• Dex-Cool coolant (pre-mixed 50/50) - Qty: 2-3 gallons

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Let the engine cool completely (best: sit overnight).
• Set the HVAC to heat later during bleeding (this helps purge air from the heater core).
• Take a photo of hose routing first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Raise the front (if needed for access)

• Use a floor jack (rated 3-ton minimum) to lift the front at a safe jacking point.
• Place jack stands (rated 3-ton minimum) under the frame and lower onto them.
• Place wheel chocks behind the rear wheels.

Step 2: Remove the lower splash shield (if equipped)

• Use a trim clip remover (specialty) to pop plastic retainers (a retainer is a plastic clip that holds panels on).
• Use a 10mm socket with a 1/4" drive ratchet to remove any small bolts.
• Set the shield and fasteners aside in a small pile.

Step 3: Relieve coolant pressure safely

• With the engine fully cool, slowly loosen the coolant reservoir cap using your hand and a shop towel.
• If you hear any hiss, stop and wait until it’s fully released, then remove the cap.

Step 4: Drain enough coolant to get below the hose level

• Position a drain pan (at least 3-gallon) under the radiator drain area.
• Use a flat-blade screwdriver only if needed to gently open the radiator drain (many open by hand).
• Drain until coolant level is below the hose you’re replacing, then close the drain.
• Save clean coolant only if it’s fresh.

Step 5: Remove the engine cover (if equipped)

• Pull up firmly by hand to release the cover from the rubber mounts.
• Set it aside.

Step 6: Remove the air intake ducting (for room, if it blocks access)

• Use an 8mm socket with a 1/4" drive ratchet to loosen intake clamps.
• Lift the duct out gently and set it aside.

Step 7: Remove the upper radiator hose (if replacing upper)

• Place a drain pan (at least 3-gallon) under the hose connection area to catch spills.
• Use hose clamp pliers (specialty) to compress spring clamps, then slide the clamp back on the hose.
• If you have screw-type clamps, use a flat-blade screwdriver to loosen them.
• Use a pick tool (specialty) to gently break the hose seal at the fitting (don’t gouge the plastic/metal nipple).
• Twist and pull the hose off. Use slip-joint pliers carefully only if it’s stuck.

Step 8: Remove the lower radiator hose (if replacing lower)

• Move the drain pan (at least 3-gallon) directly under the lower hose; this one usually spills more.
• Use hose clamp pliers (specialty) to move the clamp back.
• Use the pick tool (specialty) to break the seal, then twist and pull the hose off.
• Wipe the radiator and water pump fittings clean using shop towels.

Step 9: Install the new hose(s) and clamps

• Compare old vs new hose shape before installing (same bends, same length).
• Slide new clamps onto the hose first.
• Push the hose fully onto the fitting until it seats against the stop/bead.
• Reposition the clamp to the same area as the factory clamp (usually just behind the raised bead).
• Use hose clamp pliers (specialty) to release spring clamps into position.
• If using screw-type clamps, tighten with a flat-blade screwdriver until snug. Torque: No OEM torque spec for most hose clamps; tighten snug and do not crush the hose.
• A clamp over the bead can leak.

Step 10: Reinstall removed components

• Reinstall the air intake duct using the 8mm socket and 1/4" drive ratchet to snug clamps.
• Reinstall the engine cover by pressing down firmly by hand.
• Reinstall the splash shield using the trim clip remover (specialty) and 10mm socket.

Step 11: Refill coolant

• Insert a funnel into the coolant reservoir and fill with Dex-Cool coolant (pre-mixed 50/50) to the correct mark.
• Reinstall the reservoir cap hand-tight.

Step 12: Bleed air and check for leaks

• Start the engine and let it idle. Keep your flashlight handy for leak checks.
• Set HVAC to max heat and medium fan.
• As the engine warms up, watch the temperature gauge and inspect hose connections for seepage.
• After the thermostat opens (upper hose gets hot), shut the engine off and let it cool.
• Once cool, remove the cap and top off coolant with the funnel as needed.

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✅ After Repair

• Test drive 10-15 minutes, then recheck for leaks with a flashlight.
• After the next full cool-down, recheck coolant level and top off if needed.
• If you ever see a warning, overheating, or repeated coolant loss, stop driving and recheck clamp position and hose seating.

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💰 DIY vs Shop Cost

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

DIY Cost: $60-$180 (parts only)

You Save: $190-$370 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?

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