🔧 Grand Cherokee - Radiator Hose Replacement

This repair replaces a leaking, swollen, cracked, or soft radiator hose on your Grand Cherokee. The 3.6L V6 uses an upper and lower radiator hose, and the process is similar, but access differs slightly between the two.

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

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⚠️ Safety & Precautions

• ⚠️ Only work on the cooling system when the engine is completely cold. Hot coolant can spray out and cause serious burns.
• ⚠️ Do not remove the radiator cap or coolant reservoir cap while the engine is hot.
• ⚠️ Coolant is toxic. Keep it away from pets, children, and drains.
• ⚠️ The electric cooling fan can turn on unexpectedly. Keep fingers and tools clear of the fan area.
• ⚠️ Battery disconnect is not normally required for this hose replacement, but keep the ignition OFF during the 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 1/4-inch
• Hose clamp pliers (specialty)
• Slip-joint pliers 10-inch
• Pick tool 90-degree
• Plastic trim clip tool
• Funnel with long neck
• Clean shop towels
• Torque wrench inch-pound 1/4-inch drive
• 8mm socket
• 1/4-inch drive ratchet

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Upper radiator hose - Qty: 1, if replacing upper hose
• Lower radiator hose - Qty: 1, if replacing lower hose
• Radiator hose clamps - Qty: 2 per hose, replace if weak, rusty, or damaged
• Mopar-compatible OAT coolant concentrate or premixed 50/50 coolant - Qty: 1-2 gallons
• Distilled water - Qty: 1 gallon, only if using coolant concentrate

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📋 Before You Begin

• 📍 Park your Grand Cherokee on level ground and let the engine cool fully.
• 🅿️ Shift to PARK and apply the parking brake.
• 🧊 Wait until the upper radiator hose feels cool and soft before opening the coolant reservoir.
• 🧪 Use only OAT coolant approved for Chrysler/Jeep vehicles. Do not mix green universal coolant with the factory orange/purple OAT coolant.
• 🔎 Identify the hose you are replacing:
  • The upper radiator hose runs from the top area of the radiator to the engine thermostat/crossover area.
  • The lower radiator hose runs from the lower radiator area to the engine/water pump area.
• 🧰 A hose clamp plier is a tool that squeezes spring clamps evenly so you can slide them off without crushing the hose.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Let the Cooling System Cool Down

• Use your nitrile gloves and gently squeeze the radiator hose by hand.
• If the hose is hot, firm, or pressurized, wait longer before continuing.
• Use safety glasses before opening the system.
• Slowly loosen the coolant reservoir cap by hand to release any leftover pressure.
• Cold engine only.

Step 2: Position the Drain Pan

• Place the 2-gallon drain pan under the radiator hose connection you are removing.
• For the upper hose, place the pan under the upper radiator connection area.
• For the lower hose, place the pan under the lower radiator connection area because more coolant will drain out.

Step 3: Drain Enough Coolant

• If replacing the upper hose, you may only need to catch the coolant that spills from the hose.
• If replacing the lower hose, drain more coolant first to reduce mess.
• Use a flat-blade screwdriver 1/4-inch carefully if your radiator drain petcock is accessible.
• Turn the petcock slowly counterclockwise by hand or with the flat-blade screwdriver 1/4-inch, only enough to start flow.
• Do not force the drain petcock. Plastic radiator fittings can crack.
• If the petcock is not easy to access, skip draining through it and remove the lower hose slowly over the drain pan.

Step 4: Remove Any Plastic Access Covers if Needed

• Use the plastic trim clip tool to lift any plastic push clips blocking hose access.
• Use the 8mm socket and 1/4-inch drive ratchet if any small splash shield screws need to be removed.
• Set clips and screws aside in order so they go back in the same locations.

Step 5: Release the First Hose Clamp

• Use hose clamp pliers to squeeze the spring clamp tabs together.
• Slide the clamp back onto the hose, away from the radiator or engine fitting.
• If a worm-drive clamp is installed instead, use the flat-blade screwdriver 1/4-inch or 8mm socket to loosen it.
• A worm-drive clamp is the screw-style clamp with a small bolt head or slotted screw.

Step 6: Release the Second Hose Clamp

• Use hose clamp pliers to squeeze and move the second clamp away from the opposite hose connection.
• If needed, use slip-joint pliers 10-inch carefully to help reposition stubborn clamps.
• Do not squeeze plastic radiator necks with pliers.

Step 7: Break the Old Hose Loose

• Use your hand to twist the hose gently at each end.
• If the hose is stuck, use the pick tool 90-degree to carefully lift the hose edge and break the seal.
• Do not dig into the aluminum or plastic sealing surface.
• Pull the hose off slowly and aim coolant into the 2-gallon drain pan.
• Twist first, then pull.

Step 8: Compare the New Hose

• Place the old and new hose side by side on a clean surface.
• Check that the bends, length, and end diameters match.
• Use clean shop towels to wipe coolant off the radiator and engine hose fittings.
• Make sure no old rubber pieces are stuck to the fittings.

Step 9: Install the New Hose

• Slide the clamps onto the new hose before installing the hose.
• Push the new hose fully onto the radiator fitting by hand.
• Push the other end fully onto the engine fitting by hand.
• The hose should sit past the raised bead on each fitting. The bead is the small raised lip that helps hold the hose in place.
• Do not use oil or grease on the hose ends.

Step 10: Position and Tighten the Clamps

• Use hose clamp pliers to move spring clamps back into their original positions.
• Place each clamp just behind the raised bead on the fitting.
• If using screw-style clamps, tighten with the 8mm socket and inch-pound torque wrench.
• Torque screw-style radiator hose clamps to 30-40 in-lbs.
• Do not overtighten. Too much force can crack the radiator neck.

Step 11: Reinstall Any Covers

• Use the plastic trim clip tool to align any removed plastic clips.
• Push clips in by hand until seated.
• Use the 8mm socket and 1/4-inch drive ratchet to reinstall any splash shield screws.
• Snug the screws only. These are small fasteners in plastic panels.

Step 12: Refill the Cooling System

• Use the funnel with long neck at the coolant reservoir opening.
• Add Mopar-compatible OAT 50/50 coolant until the level reaches the COLD/FULL mark on the reservoir.
• If using concentrate, mix it 50/50 with distilled water before adding it.
• Reinstall the coolant reservoir cap by hand.

Step 13: Bleed Air from the System

• Start the engine and let it idle with the HVAC temperature set to full hot.
• Use your eyes only to check for leaks around both hose ends. Keep hands away from the fan and belt.
• Let the engine warm up until the upper hose gets warm and coolant begins circulating.
• Shut the engine off and let it cool completely.
• Use the funnel with long neck to top off the reservoir to the COLD/FULL mark after it cools.

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✅ After Repair

• ✅ Check both hose ends for drips after the first warm-up cycle.
• ✅ Recheck coolant level the next morning when the engine is cold.
• ✅ Watch the temperature gauge during the first drive. It should stay in the normal range.
• ✅ If you smell coolant, see steam, or the gauge rises above normal, stop driving and recheck the hose connections.
• ✅ Dispose of old coolant properly at a recycling or service facility. Do not pour it on the ground or into drains.

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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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🎯 Ready to get started?

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