🔧 CX-5 - Radiator Hose Replacement

On your CX-5, the radiator hoses carry coolant between the engine and radiator. Replacing a leaking, swollen, or cracked hose helps prevent overheating and engine damage.

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

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⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap on a hot engine; hot coolant can spray and burn.
• ⚠️ Support the vehicle with jack stands before working underneath.
• ⚠️ Coolant is toxic—keep it off skin, paint, and away from kids/pets; clean spills immediately.
• ⚠️ Dispose of used coolant properly (do not pour on the ground).
• ⚠️ Battery disconnect is not required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Drain pan (10-quart minimum)
• Hose clamp pliers
• Slip-joint pliers
• Flat-blade screwdriver
• 8mm socket
• 10mm socket
• Ratchet
• Extension (3-6 inch)
• Trim clip removal tool
• Pick tool
• Funnel
• 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: 2-4
• Engine coolant (Mazda FL22 compatible) - Qty: 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 fully (ideally 2+ hours) before touching hoses or opening the cooling system.
• 🧰 Set the cabin heat to HOT during bleeding later to help push air out of the system.

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🔨 Step-by-Step Instructions

Follow these steps in order:

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

• Put on safety glasses and nitrile gloves.
• Place shop rags around the radiator cap area.
• Slowly loosen the cap to the first stop, pause, then remove it fully by hand.

Step 2: Raise the front (for lower hose access)

• Use a floor jack (rated 2-ton minimum) to lift the front at the proper jacking point.
• Support the vehicle securely with jack stands (rated 2-ton minimum).

Step 3: Remove the lower engine cover (if equipped)

• Use a trim clip removal tool to pop plastic clips.
• Use an 8mm socket, 10mm socket, ratchet, and extension (3-6 inch) to remove bolts/screws.
• Set the cover and fasteners aside in a safe spot.

Step 4: Drain coolant into a pan

• Place a drain pan (10-quart minimum) under the radiator drain area.
• Use a flat-blade screwdriver to open the radiator drain cock (plastic drain valve) slowly.
• Let coolant drain until the flow slows down, then close the drain cock by hand. Do not overtighten plastic.

Step 5: Remove the upper radiator hose (top hose)

• Locate the upper hose between the radiator top outlet and the engine/thermostat housing area.
• Use hose clamp pliers to compress the spring clamp and slide it back on the hose. A hose clamp pliers is a locking pliers made to squeeze spring clamps safely.
• If you have worm-gear clamps instead, loosen them with a flat-blade screwdriver.
• Twist the hose by hand to break it loose, then pull it off. If stuck, use a pick tool gently to lift the hose edge—don’t gouge the radiator neck.
• Wipe the fittings clean using shop rags.

Step 6: Remove the lower radiator hose (bottom hose)

• From underneath, locate the lower hose between the radiator lower outlet and the engine side connection.
• Use hose clamp pliers to move the clamp back, then pull the hose off.
• Keep the drain pan (10-quart minimum) positioned—more coolant will spill when the lower hose comes off.

Step 7: Install the new hose(s) and clamps

• Compare old vs new hose shape and length before installing.
• Slide new clamps onto the hose first (if you’re replacing clamps).
• Push the hose fully onto the fitting until it seats against the stop/bead.
• Position the clamp behind the bead on the fitting (not on the very edge).
• For spring clamps, use hose clamp pliers to place them. For worm-gear clamps, tighten with a flat-blade screwdriver until snug—do not crush the plastic radiator neck.

Step 8: Reinstall the lower engine cover

• Reinstall the cover using the 8mm socket, 10mm socket, ratchet, and extension (3-6 inch).
• Reinstall clips using the trim clip removal tool.

Step 9: Refill coolant

• Make sure the radiator drain cock is closed.
• Use a funnel to fill the radiator with engine coolant (Mazda FL22 compatible) until full.
• Fill the reservoir to the FULL mark.

Step 10: Bleed air and check for leaks

• Start the engine and let it idle.
• Set the HVAC to the hottest temp and medium fan (this helps purge air).
• Watch the coolant level in the radiator neck; add coolant using a funnel as the level drops.
• When the engine warms up, the upper hose should get hot (thermostat opening). Keep hands clear of fans.
• Once bubbles calm down, install the radiator cap by hand.
• Inspect both hose connections with a flashlight and shop rags for seepage.

Step 11: Lower the vehicle

• Use the floor jack (rated 2-ton minimum) to lift slightly, remove jack stands (rated 2-ton minimum), then lower the vehicle.

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✅ After Repair

• 🧪 Take a 10-15 minute test drive while watching the temperature gauge.
• 🧪 After the engine fully cools, recheck the radiator level and reservoir level; top off as needed.
• 🧪 Recheck for leaks at the upper and lower hose connections the next day.
• 🧪 If the cabin heat is weak or the gauge fluctuates, stop and re-bleed (air is still trapped).

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💰 DIY vs Shop Cost

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

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

You Save: $210-$330 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.