🔧 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 upper and lower radiator hoses, and the process is similar, but the lower hose drains more coolant and is messier.

Difficulty Level: Beginner to Intermediate | 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 cause severe burns.
• ⚠️ Do not remove the coolant reservoir cap while the engine is hot or warm.
• ⚠️ Coolant is poisonous to people and animals. Catch all coolant in a drain pan and clean spills immediately.
• ⚠️ Support the vehicle with jack stands if you raise it. Never rely on a floor jack alone.
• ⚠️ Battery disconnect is not normally 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
• Hose clamp pliers
• Flat-blade screwdriver 1/4-inch
• Trim clip removal tool
• 8mm socket
• 10mm socket
• Ratchet 3/8-inch drive
• Torque wrench 3/8-inch drive
• Floor jack rated 3-ton minimum
• Jack stands rated 3-ton minimum
• Funnel with long neck
• Shop towels
• Plastic scraper

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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
• Engine coolant meeting Chrysler MS-12106 specification - Qty: 1 gallon concentrate or 2 gallons premixed
• Distilled water - Qty: 1 gallon if using concentrate

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📋 Before You Begin

• Park your Grand Cherokee on level ground and let the engine cool fully, ideally overnight.
• Set the parking brake and keep the transmission in Park.
• If replacing the lower radiator hose, raise the front with a floor jack rated 3-ton minimum and support it with jack stands rated 3-ton minimum.
• Use only coolant compatible with Chrysler MS-12106. Mixing the wrong coolant can cause sludge or cooling system damage.
• A hose clamp plier is a tool that squeezes spring-style hose clamps so you can slide them off safely.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Let the Cooling System Cool

• Put on safety glasses and nitrile gloves.
• Touch the upper radiator hose carefully with your hand. It must feel cool before you continue.
• Slowly loosen the coolant reservoir cap by hand to release any leftover pressure.
• Cold engine only.

Step 2: Remove the Lower Splash Shield if Needed

• If you need access to the lower hose, use a trim clip removal tool to remove plastic push clips from the lower shield.
• Use an 8mm socket or 10mm socket with a ratchet 3/8-inch drive to remove any shield fasteners.
• Set the shield and fasteners aside in order.

Step 3: Position the Drain Pan

• Place a drain pan 2-gallon minimum under the hose connection you are removing.
• If replacing the upper hose, position the pan under the radiator side of the upper hose.
• If replacing the lower hose, position the pan directly under the lower radiator outlet.

Step 4: Drain Enough Coolant

• Use a flat-blade screwdriver 1/4-inch only if needed to help guide flow into the drain pan; do not pry hard on plastic radiator fittings.
• For the upper hose, you usually only need to drain coolant below the upper hose level.
• For the lower hose, expect most of the radiator coolant to drain when the hose is loosened.
• If your radiator drain petcock is accessible, open it carefully by hand or with the flat-blade screwdriver 1/4-inch, then close it once flow slows.
• Go slowly to reduce spills.

Step 5: Release the Hose Clamps

• Use hose clamp pliers to squeeze the spring clamp tabs together.
• Slide each clamp back onto the hose, away from the radiator and engine fittings.
• If a worm-drive clamp is installed, loosen it with a flat-blade screwdriver 1/4-inch.
• Do not squeeze or twist the plastic radiator neck aggressively.

Step 6: Remove the Old Radiator Hose

• Twist the hose gently by hand to break it loose from the fitting.
• If it is stuck, use a plastic scraper to carefully separate the hose edge from the fitting.
• Pull the hose straight off once it moves freely.
• Do not use a knife near the plastic radiator neck unless absolutely necessary.
• Protect plastic fittings.

Step 7: Clean and Inspect the Hose Fittings

• Use shop towels to wipe the radiator and engine hose fittings clean.
• Use a plastic scraper to remove stuck rubber residue.
• Inspect the fittings for cracks, pitting, or broken plastic. If a fitting is damaged, do not install the new hose until that part is repaired.

Step 8: Install the New Radiator Hose

• Compare the new radiator hose to the old one before installing it.
• Slide the radiator hose clamps onto the new hose first.
• Push the hose fully onto the radiator and engine fittings by hand.
• Use hose clamp pliers to move spring clamps into the original clamp marks.
• If using worm-drive clamps, tighten with a flat-blade screwdriver 1/4-inch until snug. Do not overtighten on plastic fittings.
• Torque to snug only for worm-drive clamps; no OEM torque spec is used for spring clamps.

Step 9: Reinstall the Lower Splash Shield

• Lift the splash shield into place by hand.
• Install clips using the trim clip removal tool as a guide if needed.
• Use an 8mm socket or 10mm socket with a torque wrench 3/8-inch drive to tighten shield fasteners.
• Torque small splash shield fasteners to 5-7 Nm (44-62 in-lbs).

Step 10: Refill the Cooling System

• Place a funnel with long neck into the coolant reservoir.
• Add engine coolant meeting Chrysler MS-12106 specification until the coolant reaches the proper cold-fill mark.
• If using concentrate, mix it 50/50 with distilled water before filling.
• Install the coolant reservoir cap by hand.

Step 11: Bleed Air from the Cooling System

• Start the engine and let it idle with the heater set to full hot and blower on low.
• Watch the coolant temperature gauge. Do not let the engine overheat.
• Use shop towels to check around the new hose connections for leaks.
• After the thermostat opens, the upper radiator hose will become warm and firm.
• Shut the engine off and let it cool completely.
• Recheck the coolant level and top off with the funnel with long neck if needed.

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✅ After Repair

• ✅ Check for leaks with the engine cold, then again after a short drive.
• ✅ Recheck the coolant level the next morning and top off only to the cold-fill mark.
• ✅ Make sure the heater blows hot air at idle. No heat can mean trapped air or low coolant.
• ✅ Watch the temperature gauge during the first few drives. Stop immediately if it rises above normal.
• ✅ Dispose of old coolant properly at an auto parts store or recycling center. 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-$110 parts only

You Save: $145-$240 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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