🔧 F-350 Super Duty - Radiator Hose Replacement

Replacing a radiator hose stops coolant leaks and prevents overheating. The job is mostly about safely relieving pressure, draining enough coolant, and swapping the hose without damaging the radiator/engine fittings.

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

Assumption: You’re replacing either the upper or lower radiator hose on the 6.2L; steps below cover both.

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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 if you go underneath; never rely on a jack.
• ⚠️ Keep coolant off paint and away from pets; it’s toxic and slippery.
• ⚠️ Let the cooling fan stop completely before working near it.
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Drain pan (at least 3 gallons)
• Funnel
• Shop rags
• Hose clamp pliers (specialty)
• Slip-joint pliers
• Pick tool (specialty)
• Flathead screwdriver
• 8mm socket
• 10mm socket
• 1/4" drive ratchet
• 3" extension
• Trim clip removal tool
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks

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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
• Engine coolant (Ford-approved, 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 fully (ideally 2+ hours).
• Set the HVAC to full HOT later during bleeding (this helps purge air from the heater core).
• If you need access from below for the lower hose, lift the front with a floor jack and set it on jack stands at the frame.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve cooling system pressure (cold engine only)

• Put on nitrile gloves and safety glasses.
• Place shop rags around the coolant degas bottle/cap area.
• Slowly loosen the coolant cap by hand to the first stop to vent any leftover pressure, then remove it fully.

Step 2: Drain enough coolant to get below hose level

• Position a drain pan (at least 3 gallons) under the radiator drain area.
• If equipped with an accessible drain cock, open it carefully by hand or with a flathead screwdriver (only if it has a screwdriver slot) and drain 1-2 gallons.
• If there’s no easy drain access, you can drain from the lower hose in Step 5—just be ready for a larger spill.

Step 3: Remove the intake ducting for access (if it blocks the upper hose)

• Use an 8mm socket with a 1/4" drive ratchet to loosen the intake tube clamps as needed.
• Release any plastic retainers with a trim clip removal tool.
• Move the ducting aside without straining any wiring.

Step 4: Identify the hose you’re replacing

• Upper radiator hose: runs from the top of the radiator to the thermostat/water outlet on the engine.
• Lower radiator hose: runs from the bottom of the radiator to the water pump inlet area; access is often easier from underneath.

Step 5: Release the hose clamps

• Use hose clamp pliers (specialty) to compress the factory spring clamps. (These pliers lock and hold the clamp open so your hands stay safe.)
• Slide each clamp back onto the hose, about 2-3 inches away from the fitting.
• If your truck has worm-gear clamps instead, loosen them with an 8mm socket or flathead screwdriver.

Step 6: Break the hose loose without damaging the radiator neck

• Twist the hose gently by hand to break the seal.
• If it’s stuck, use a pick tool (specialty) to carefully lift the hose edge and let air in, then twist again.
• Do not pry hard against the radiator neck; it can crack.

Step 7: Remove the old hose and control the spill

• Pull the hose off the fitting while holding it aimed into the drain pan.
• Use shop rags to catch drips around the fan shroud and belts.

Step 8: Prep the fittings and compare parts

• Wipe the radiator neck and engine fitting clean using shop rags.
• Confirm the new hose matches the old one for length, bends, and end diameter.
• Install new clamps onto the new hose before you put the hose on the truck.

Step 9: Install the new hose

• Push the hose fully onto the radiator neck until it bottoms out.
• Push the other end fully onto the engine-side fitting.
• Position the clamps centered over the fitting bead (the raised ridge), then release using hose clamp pliers (specialty) or tighten using an 8mm socket.
• Tip: Misplaced clamps cause repeat leaks.

Step 10: Reinstall removed components

• Reinstall intake ducting and clips using the trim clip removal tool.
• Tighten intake clamps using an 8mm socket and 1/4" drive ratchet.

Step 11: Refill coolant

• Close the drain cock by hand (snug only) if you opened it.
• Use a funnel to refill the degas bottle with Ford-approved, pre-mixed 50/50 coolant to the MAX line.
• If you drained a lot, refill slowly to reduce trapped air.

Step 12: Bleed air and verify no leaks

• Start the engine and let it idle with the coolant cap off for a few minutes while watching the coolant level.
• Set heat to full HOT and fan to medium.
• As the thermostat opens, the level may drop; add coolant using the funnel to maintain level.
• Once bubbles reduce and the level stabilizes, install the cap by hand.
• Let the engine reach normal operating temperature and inspect both hose ends for leaks using a light and safety glasses.

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✅ After Repair

• Recheck coolant level after the first full heat-soak cycle (drive, cool down completely), then top off to the MAX line using a funnel.
• Inspect for dried coolant residue or wetness at both hose connections.
• Watch the temp gauge on the first drive; shut down if it overheats.
• Dispose of old coolant properly (sealed container; recycling center/auto parts store).

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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 1.0-1.8 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.