🔧 Explorer - Radiator Hose Replacement

Replacing a radiator hose means safely draining some coolant, removing the old hose and clamps, then refilling and purging air so your cooling system doesn’t overheat. On your Explorer, there are usually two main radiator hoses: the upper hose (radiator to engine) and the lower hose (radiator to thermostat/water pump area).

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; wait until fully cool.
• ⚠️ Coolant is toxic; keep it off skin and away from pets/kids, and store in a sealed container.
• ⚠️ Support the Explorer with jack stands if you lift it; never rely on a jack alone.
• ⚠️ If the hose failed while overheating, let the engine cool completely before working.
• 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
• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Drain pan (at least 3-gallon)
• Funnel
• Hose clamp pliers
• Channel-lock pliers
• Pick tool
• Flat-blade screwdriver
• 8mm nut driver
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive extension (6")
• Trim clip removal tool
• 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 clamps - Qty: 2
• Engine coolant (Motorcraft-spec, pre-mixed 50/50) - Qty: 1-2 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 (upper radiator hose should feel cool, not warm).
• Locate the coolant reservoir (Ford calls it a degas bottle, which is the pressurized coolant tank).
• If you’re doing the lower hose, plan to raise the front and support it on jack stands.
• Take a photo of hose routing first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm which hose you’re replacing

• Upper hose = runs from the top of the radiator to the engine.
• Lower hose = runs from the bottom of the radiator to the thermostat/water pump area.
• If you’re not sure, use a flashlight and trace the hose from the radiator tank.

Step 2: Remove pressure from the cooling system (engine cold)

• Place shop towels around the coolant reservoir cap.
• Slowly loosen the cap to the first stop to vent any remaining pressure, then remove it.

Step 3: Raise the front (recommended for lower hose)

• Use a floor jack (rated 3-ton minimum) to lift the front at the proper jacking point.
• Support with jack stands (rated 3-ton minimum).

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

• Position a drain pan (at least 3-gallon) under the lower radiator area.
• If access requires it, remove any lower splash shield fasteners using a 10mm socket, 3/8" ratchet, and trim clip removal tool.
• Open the radiator drain (petcock) using a flat-blade screwdriver (only if your radiator has one).
• Drain until the coolant level is below the hose connection you’re removing.
• Drain less = less mess later.

Step 5: Remove the hose clamps

• Most Explorers use spring clamps (a clamp you squeeze to open). Use hose clamp pliers to compress the clamp and slide it back on the hose.
• If you have a screw-style clamp instead, loosen it with an 8mm nut driver or flat-blade screwdriver.

Step 6: Remove the radiator hose

• Twist the hose to break it free. Use channel-lock pliers gently if needed (don’t crush plastic radiator/thermostat necks).
• If it’s stuck, carefully work around the hose end with a pick tool to release it.
• Pull the hose off and aim it into the drain pan for the remaining coolant.

Step 7: Prep the fittings and compare parts

• Wipe the radiator/engine hose necks clean using shop towels.
• Compare the new hose to the old one (same bends, same length, same end diameters).
• If the old clamps are rusted, weak, or deformed, replace them.

Step 8: Install the new hose and position the clamps

• Slide the clamps onto the hose first.
• Push the hose fully onto each fitting until it bottoms out.
• Reposition the clamp over the sealing area (usually right behind the raised bead on the fitting) using hose clamp pliers.
• If using screw-style clamps, tighten with an 8mm nut driver until snug; do not overtighten plastic fittings.

Step 9: Reinstall any shields/ducts removed

• Reinstall the splash shield and fasteners using a 10mm socket, 3/8" ratchet, and trim clip removal tool.

Step 10: Refill coolant

• Use a funnel to refill the degas bottle with the correct Motorcraft-spec pre-mixed 50/50 coolant.
• Fill to the “MAX” line (or slightly below if indicated on the tank).
• Reinstall the cap.

Step 11: Purge air and check for leaks

• Start the engine and set the HVAC to HOT with the fan on medium (this helps coolant flow through the heater core).
• Let the engine idle and watch for leaks at both ends of the new hose using a flashlight.
• After the engine reaches operating temperature, shut it off and let it cool fully.
• Recheck the coolant level in the degas bottle and top off using a funnel if needed.

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✅ After Repair

• Test drive 10–15 minutes while monitoring the temperature gauge.
• Park, let it cool, and recheck coolant level again; top off if needed.
• Inspect for dried coolant residue or wetness around the hose ends the next morning.
• Dispose of old coolant properly (parts stores often accept it).

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

DIY Cost: $40-$120 (parts only)

You Save: $130-$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.