🔧 Flex - Radiator Hose Replacement

Replacing a radiator hose fixes coolant leaks and prevents overheating. On your Flex, the job is mostly about safely draining some coolant, swapping the hose (upper and/or lower), then refilling and bleeding air out of the cooling system.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.0 hours

Assumption: You’re replacing either the upper or lower radiator hose; steps 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 Flex with jack stands if you go underneath; never rely on a jack alone.
• ⚠️ Keep coolant off the ground; it’s toxic to people and pets and tastes sweet.
• ⚠️ If the cooling fan turns on automatically, keep hands and tools clear.
• 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 2-gallon)
• Funnel
• Trim clip removal tool
• Flat-blade screwdriver
• 8mm socket
• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• Slip-joint pliers
• Hose clamp pliers (specialty)
• Pick tool (small)
• Flashlight
• 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
• Hose clamps - Qty: 2
• Engine coolant (Ford-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 place wheel chocks behind the rear wheels.
• Let the engine cool fully (the upper radiator hose should feel cool to the touch).
• Set your drain pan under the radiator area.
• Tip: Take a quick photo of hose routing first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower splash shield (if equipped)

• Use a floor jack (rated 3-ton minimum) to lift the front at the proper jacking point.
• Set the Flex onto jack stands (rated 3-ton minimum).
• Use a trim clip removal tool and 8mm socket with a 1/4" drive ratchet to remove the fasteners and drop the shield.

Step 2: Relieve pressure safely

• Place a shop rag over the coolant reservoir 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

• Position the drain pan (at least 2-gallon) under the radiator drain area.
• If your radiator has a drain valve, open it with a flat-blade screwdriver (turn gently).
• If there’s no drain valve access, you can drain by loosening the lower radiator hose clamp in Step 5 and letting coolant flow into the pan.
• Drain until coolant level is below the hose you’re replacing, then stop the drain.

Step 4: Identify which hose you’re replacing

• Upper radiator hose: runs from the top of the radiator to the engine (near the thermostat housing).
• Lower radiator hose: runs from the bottom of the radiator to the engine.

Step 5: Remove the hose clamps

• Most Flex radiator hoses use spring clamps (they look like a steel ring with “ears”).
• Use hose clamp pliers (specialty) to squeeze the clamp ears and slide the clamp back on the hose.
• If you don’t have clamp pliers, use slip-joint pliers carefully.
• Hose clamp pliers are made to grip clamps securely.

Step 6: Break the hose loose and remove it

• Twist the hose gently by hand to break the seal.
• If it’s stuck, use a pick tool (small) to carefully lift the hose edge to let air in.
• Pull the hose off the radiator neck and the engine neck.
• Use a flashlight to confirm the old hose didn’t leave any rubber stuck on the fittings.

Step 7: Install the new hose

• Compare the new hose to the old one (length, bends, end diameters).
• Slide the new clamps onto the hose before installing.
• Push the hose fully onto each fitting until it bottoms out against the stop bead.
• Use hose clamp pliers (specialty) to move the clamp into position behind the bead.
• Tip: Don’t use oil or grease on hose ends.

Step 8: Reinstall the splash shield

• Lift the shield into place.
• Use the trim clip removal tool, 8mm socket, 1/4" drive ratchet, and 6" extension (1/4" drive) to reinstall all fasteners snug.

Step 9: Refill coolant

• Use a funnel to refill the coolant reservoir with Engine coolant (Ford-spec, pre-mixed 50/50) to the MAX line.
• Reinstall the reservoir cap hand-tight.

Step 10: Bleed air from the cooling system

• Start the engine and set the heater to full HOT (this helps purge air).
• Let it idle until the engine warms up and you get steady heat from the vents.
• Watch the temperature gauge; it should stay normal.
• Shut the engine off and let it cool completely, then recheck coolant level and top off as needed using the funnel.
• Use shop rags to wipe any spilled coolant and recheck for drips.

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✅ After Repair

• With the engine running, inspect both hose ends for leaks using a flashlight.
• After the first drive, let it cool and recheck the coolant level (top off if needed).
• Check for a sweet smell, wet spots, or crusty residue near the clamps over the next few days.

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💰 DIY vs Shop Cost

Shop Cost: $250-$500 (parts + labor)

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

You Save: $110-$460 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.