🔧 Focus - Radiator Hose Replacement

Assumption: This guide covers replacing either the upper or lower radiator hose on your Focus. The process is very similar for both hoses.

The radiator hoses carry hot coolant between the engine and radiator. Replace a hose if it is cracked, swollen, leaking, soft, oil-soaked, or has coolant crust around the ends.

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

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant reservoir cap when the engine is hot. Hot coolant can spray out and burn you.
• 🧊 Let the engine cool completely before starting. Wait at least 2-3 hours after driving.
• 🧤 Wear gloves and safety glasses. Coolant is slippery, toxic, and irritating to skin.
• 🐾 Keep coolant away from pets and children. It can be poisonous even in small amounts.
• 🔋 Battery disconnect is not required for this repair.
• 🌡️ Your Focus uses a pressurized coolant reservoir. Refill and bleed air through the reservoir, not a traditional radiator cap.

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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-head screwdriver 1/4 inch
• Hose clamp pliers
• Slip-joint pliers 10 inch
• Pick tool 90-degree
• Funnel with long neck
• Clean shop towels
• Plastic trim clip remover
• 8mm socket
• 10mm socket
• Ratchet 3/8 inch drive
• Coolant tester (specialty)

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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 if replacing lower hose
• Radiator hose clamps - Qty: 2 per hose if not pre-installed
• Motorcraft-compatible orange coolant concentrate - Qty: 1 gallon
• Distilled water - Qty: 1 gallon if using concentrate
• Premixed 50/50 coolant - Qty: 1-2 gallons if not using concentrate

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📋 Before You Begin

• 🅿️ Park your Focus on level ground and set the parking brake.
• 🧊 Make sure the engine is completely cold before opening the coolant reservoir.
• 🪣 Place a drain pan under the hose area before loosening any clamp.
• 🧰 Hose clamp pliers are pliers made to squeeze spring-style clamps evenly so the clamp can slide back safely.
• 🧪 Only mix coolant types if the replacement coolant specifically says it is compatible with Ford orange coolant.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Cool the Engine and Open the Hood

• Use safety glasses and nitrile gloves before touching any cooling system parts.
• Open the hood and locate the coolant reservoir on the passenger-side area of the engine bay.
• Touch the upper radiator hose with a gloved hand. It must feel cool and soft, not hot or pressurized.
• Slowly loosen the coolant reservoir cap by hand to release any leftover pressure.
• Cold engine only.

Step 2: Position the Drain Pan

• Use a drain pan 2-gallon minimum and place it directly under the hose connection you are replacing.
• If replacing the upper radiator hose, place the pan under the upper radiator outlet area.
• If replacing the lower radiator hose, place the pan under the lower radiator outlet area. More coolant will drain from the lower hose.

Step 3: Remove Any Access Covers if Needed

• Use a plastic trim clip remover to remove any plastic push clips blocking hose access.
• Use an 8mm socket or 10mm socket with a 3/8 inch ratchet if an air duct, splash shield, or small bracket blocks your hand access.
• Set clips and bolts aside in order so they go back in the same places.
• Torque small cover bolts to 8 Nm (71 in-lbs) during reassembly if removed.

Step 4: Release the First Hose Clamp

• Use hose clamp pliers to squeeze the tabs on the spring clamp.
• Slide the clamp back at least 1 inch from the hose end.
• If your replacement hose uses screw-style clamps, use a flat-head screwdriver 1/4 inch to loosen them.
• Do not pry against the plastic radiator neck. It can crack.

Step 5: Break the Hose Loose

• Use slip-joint pliers 10 inch to gently twist the hose left and right.
• If it is stuck, use a 90-degree pick tool carefully between the hose and metal/plastic fitting to break the seal.
• Do not dig the pick into the radiator neck or thermostat housing.
• Pull the hose off by hand once it moves freely.
• Twist first, pull second.

Step 6: Release the Other Hose End

• Use hose clamp pliers to squeeze the clamp on the other end of the hose.
• Slide the clamp back away from the fitting.
• Use slip-joint pliers 10 inch to gently twist the hose loose.
• Pull the hose off by hand and let coolant drain into the pan.

Step 7: Compare the New Hose

• Place the old hose next to the new hose on a clean surface.
• Check that the bends, length, and inside diameter match.
• If the hose has an alignment mark or molded shape, make sure it faces the same direction as the old hose.
• Use clean shop towels to wipe the radiator neck and engine fitting clean.

Step 8: Install the New Hose

• Slide the clamps onto the new hose before installing the hose.
• Push the hose fully onto the first fitting by hand until it seats against the raised stop bead.
• Push the other end fully onto its fitting by hand.
• Use hose clamp pliers to move each spring clamp into its original clamp mark on the hose.
• If using screw-style clamps, tighten with a flat-head screwdriver 1/4 inch until snug. Do not crush the hose.
• Torque screw-style hose clamps to 3-4 Nm (27-35 in-lbs) if a torque screwdriver is available.

Step 9: Reinstall Any Removed Covers

• Use a plastic trim clip remover to reinstall plastic push clips by hand.
• Use an 8mm socket or 10mm socket with a 3/8 inch ratchet to reinstall any removed cover bolts.
• Torque small cover bolts to 8 Nm (71 in-lbs).

Step 10: Refill the Cooling System

• Use a funnel with long neck in the coolant reservoir opening.
• Fill with correct 50/50 coolant mixture until the level reaches the MAX line on the reservoir.
• If using concentrate, mix coolant and distilled water 50/50 before pouring.
• Reinstall the coolant reservoir cap by hand.

Step 11: Warm the Engine and Bleed Air

• Start the engine and let it idle with the heater set to full hot and blower on low.
• Watch the temperature gauge. It should rise normally and stay in the normal range.
• Let the engine idle until the radiator fan cycles on once, if conditions allow.
• Shut the engine off and let it cool completely.
• Once cold, remove the reservoir cap by hand and top off coolant to the MAX line if needed.

Step 12: Check for Leaks

• Use a flashlight to inspect both ends of the new hose.
• Look for wet coolant, drips, steam, or white/orange crust forming around the clamp areas.
• Use clean shop towels to dry the area, then recheck after a short drive.
• Use a coolant tester to verify freeze/boil protection after the system is fully mixed.

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✅ After Repair

• ✅ Recheck coolant level the next morning when the engine is cold.
• 🚗 Take a short 10-15 minute test drive and watch the temperature gauge.
• 🔍 Inspect both hose ends again after the test drive.
• ♻️ Dispose of old coolant at a recycling center or auto parts store that accepts used coolant.
• 🧽 Rinse away spilled coolant with water so it does not attract pets or leave slippery residue.

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💰 DIY vs Shop Cost

Shop Cost: $180-$350 parts + labor

DIY Cost: $35-$120 parts only

You Save: $145-$230 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.8-1.5 hours.

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