🔧 Focus - Radiator Hose Replacement

Replacing a radiator hose on your Focus means draining some coolant, removing the leaking or worn hose, installing a new hose and clamps, then refilling and bleeding the cooling system. This prevents coolant leaks, overheating, and possible engine damage.

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

Assumption: These steps apply to either the upper or lower radiator hose.

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⚠️ Safety & Precautions

• ⚠️ Work only when the engine is completely cold. Hot coolant can spray out and burn you.
• ⚠️ Never remove the coolant reservoir cap on a hot engine.
• ⚠️ Coolant is toxic. Keep it away from children, pets, and open containers.
• ⚠️ If you raise the front of your Focus, always use jack stands. Never work under a vehicle held only by a jack.
• ⚠️ 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 2-gallon minimum
• Flat-blade screwdriver 6mm tip
• Hose clamp pliers (specialty)
• Slip-joint pliers 10-inch
• Pick tool 90-degree (specialty)
• 10mm socket
• 3/8-inch drive ratchet
• 3/8-inch drive extension 6-inch
• Floor jack rated 2-ton minimum
• Jack stands rated 2-ton minimum
• Funnel with narrow spout
• Clean shop towels
• Cooling system pressure tester (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Radiator hose - Qty: 1
• Radiator hose clamps - Qty: 2
• Motorcraft-compatible orange coolant concentrate or premixed coolant - Qty: 1 gallon
• Distilled water - Qty: 1 gallon if using coolant concentrate

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📋 Before You Begin

• Park your Focus on level ground and set the parking brake.
• Let the engine cool completely, preferably for several hours.
• Open the hood and locate the coolant reservoir on the passenger side of the engine bay.
• A hose clamp is the metal band that squeezes the hose tightly onto the radiator or engine fitting.
• A pick tool is a small hooked tool used to gently loosen a stuck rubber hose without cutting it.
• If replacing the lower radiator hose, raise the front with a floor jack and support it with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve Cooling System Pressure

• Put on safety glasses and nitrile gloves.
• Make sure the engine is fully cold before touching the coolant reservoir cap.
• Slowly loosen the coolant reservoir cap by hand, then remove it.
• Cold engine only.

Step 2: Raise the Front if Needed

• If you are replacing the lower radiator hose, use the floor jack rated 2-ton minimum to lift the front of your Focus.
• Place jack stands rated 2-ton minimum under the front support points.
• Lower the vehicle gently onto the jack stands before working underneath.

Step 3: Place the Drain Pan

• Slide the drain pan 2-gallon minimum under the radiator hose connection you are removing.
• The lower hose will drain more coolant than the upper hose.
• Keep clean shop towels nearby for spills.

Step 4: Remove the Lower Shield if It Blocks Access

• If the lower splash shield is in the way, use a 10mm socket, 3/8-inch drive ratchet, and 3/8-inch drive extension 6-inch to remove the fasteners.
• Set the fasteners aside in order so they go back in the same locations.
• No major torque is required for the splash shield fasteners; reinstall them snugly later.

Step 5: Move the Hose Clamps Back

• Use hose clamp pliers (specialty) to squeeze the spring clamp tabs together.
• Slide each clamp several inches back onto the hose.
• If your hose has screw-style clamps, use a flat-blade screwdriver 6mm tip to loosen each clamp.

Step 6: Remove the Old Hose

• Twist the hose by hand to break it loose from the fitting.
• If the hose is stuck, use the pick tool 90-degree (specialty) to gently lift the hose edge.
• Do not scratch, gouge, or pry hard against the plastic radiator neck or thermostat housing.
• If needed, use slip-joint pliers 10-inch lightly to rotate the hose, not crush it.
• Pull the hose off and allow coolant to drain into the pan.
• Twist first, then pull.

Step 7: Inspect the Fittings

• Use clean shop towels to wipe the radiator and engine-side fittings clean.
• Check for cracks, broken plastic, corrosion, or leftover pieces of old hose.
• If a plastic fitting is cracked, stop and replace that part before installing the new hose.

Step 8: Install the New Hose

• Compare the new radiator hose to the old one to confirm the shape and length match.
• Slide the new radiator hose clamps onto the hose before installing it.
• Push the hose fully onto each fitting until it passes the raised bead.
• The raised bead is the small ridge on the fitting that helps keep the hose from slipping off.
• Use hose clamp pliers (specialty) to move spring clamps into position just behind the raised bead.
• If using screw-style clamps, tighten them with a flat-blade screwdriver 6mm tip until snug.
• Torque to snug only; do not overtighten hose clamps on plastic fittings.

Step 9: Reinstall the Splash Shield

• If removed, hold the shield in place by hand.
• Use the 10mm socket, 3/8-inch drive ratchet, and 3/8-inch drive extension 6-inch to reinstall the fasteners.
• Torque to snug only; do not strip the small shield fasteners.

Step 10: Refill the Coolant

• Place the funnel with narrow spout into the coolant reservoir opening.
• Add Motorcraft-compatible orange coolant. If using concentrate, mix it 50/50 with distilled water.
• Fill the reservoir to the MAX line.
• Install the coolant reservoir cap by hand.

Step 11: Bleed Air from the Cooling System

• Start the engine and let it idle.
• Set the heater to full hot and the fan to low.
• Watch the temperature gauge closely.
• Let the engine warm up until the upper radiator hose gets warm and the heater blows warm air.
• Shut the engine off and let it cool completely.
• Remove the coolant reservoir cap by hand only after it is cold, then top off to the MAX line if needed.
• Air pockets can cause overheating.

Step 12: Pressure Check and Leak Check

• Use clean shop towels to dry both hose ends.
• Use a cooling system pressure tester (specialty) if available to pressurize the system and check for leaks.
• If you do not have a pressure tester, let the engine idle and inspect both hose connections carefully.
• If you see a leak, shut the engine off, let it cool fully, then reposition the clamp with hose clamp pliers (specialty).

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✅ After Repair

• Drive your Focus for 10-15 minutes while watching the temperature gauge.
• Park on level ground and check for drips under the front of the vehicle.
• After the engine cools completely, recheck the coolant level.
• Top off the reservoir to the MAX line if needed.
• Recycle the old coolant at an approved coolant disposal or recycling location.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $35-$95 (parts only)

You Save: $145-$255 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1-1.5 hours.

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🎯 Ready to get started?

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