🔧 Impala - Radiator Hose Replacement

Replacing a radiator hose means draining some coolant, removing the old hose and clamps, then installing the new hose and refilling/bleeding the cooling system. This is usually done because the hose is leaking, swollen, cracked, or the clamp area is weeping coolant.

Difficulty Level: Beginner | 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 you.
• ⚠️ Support the car with jack stands if you lift it; never rely on a floor jack alone.
• ⚠️ Coolant is toxic to people and pets; catch it in a drain pan and clean spills immediately.
• ⚠️ Keep hands/loose clothing away from the radiator fans; they can turn on automatically.
• ⚠️ Battery disconnect is not required for this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Drain pan (at least 3-gallon)
• Slip-joint pliers
• Hose clamp pliers (specialty)
• Flathead screwdriver
• Utility knife
• Pick tool (small) (specialty)
• Funnel
• Shop rags
• Flashlight

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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
• Engine coolant (Dex-Cool compatible) 50/50 premix - Qty: 1-2 gallons

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📋 Before You Begin

• Park on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Let the engine cool fully (top radiator hose should feel cool to the touch).
• Set the HVAC to HOT later during bleeding so coolant flows through the heater core.
• If you need more room for the lower hose, lift the front with a floor jack and support with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve pressure safely

• Use shop rags and slowly loosen the coolant pressure cap (on the reservoir) to release any leftover pressure.
• If you hear hissing, stop and wait until it fully stops.

Step 2: Drain enough coolant to get below the hose level

• Place a drain pan (at least 3-gallon) under the radiator area.
• If equipped with a drain cock (petcock), open it using a flathead screwdriver and drain 1–2 gallons.
• If you can’t access a drain cock, you can drain by removing the lower hose in Step 5, but expect a faster gush of coolant into the drain pan.
• Keep the drain pan centered; flow can shift.

Step 3: Identify which hose you’re replacing

• Upper radiator hose: runs from the top of the radiator to the engine/thermostat housing area.
• Lower radiator hose: runs from the bottom of the radiator to the engine (water pump inlet area).
• A common clamp type is a spring clamp (a round clamp you squeeze to loosen).

Step 4: Remove the upper hose (if replacing upper)

• Use hose clamp pliers (specialty) or slip-joint pliers to squeeze the spring clamp and slide it back on the hose.
• Twist the hose by hand to break it free, then pull it off the radiator neck.
• Repeat at the engine end.
• If the hose is stuck, carefully work a pick tool (small) (specialty) under the hose end to break the seal, then twist again.

Step 5: Remove the lower hose (if replacing lower)

• Position the drain pan (at least 3-gallon) directly under the lower radiator outlet.
• Use hose clamp pliers (specialty) or slip-joint pliers to move the spring clamp back.
• Twist and pull the hose off the radiator first, letting coolant drain into the pan.
• Remove the other end from the engine connection.

Step 6: Deal with a hose that won’t come off

• If the hose is hardened and won’t release, use a utility knife to slit the hose lengthwise near the end.
• Peel it off carefully—do not gouge the radiator neck or engine fitting.
• Cut the hose, not the plastic/metal neck.

Step 7: Prep the fittings and install the new hose

• Wipe the radiator neck and engine fitting clean using shop rags.
• Slide the clamps onto the new hose before installing the hose.
• Push the hose on until it bottoms out against the hose stop/bead on the fitting.
• Use hose clamp pliers (specialty) to position each clamp behind the bead (not on the very end of the hose).

Step 8: Refill coolant

• Use a funnel to refill the coolant reservoir with Dex-Cool compatible 50/50 premix.
• Fill to the COLD mark.
• If you opened the radiator drain cock, close it (snug only) using a flathead screwdriver.

Step 9: Bleed air from the cooling system

• Start the engine and set the heater to HOT and fan on medium.
• Let the engine idle while watching the temperature gauge; add coolant as the level drops using a funnel.
• As it warms up, squeeze the upper radiator hose carefully (with gloves) to help move trapped air.
• When the heater blows hot and the coolant level stabilizes, install the cap.
• Check for leaks with a flashlight around both hose ends.

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✅ After Repair

• Top off the reservoir to the correct mark after the engine cools completely (re-check after your first drive).
• Test drive 10–15 minutes, then inspect for seepage at both clamps using a flashlight.
• If the temp gauge runs hotter than normal or the heater goes cold, stop and re-bleed (air pocket likely).
• Dispose of old coolant properly (most parts stores accept used coolant).

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💰 DIY vs Shop Cost

Shop Cost: $250-$500 (parts + labor)

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

You Save: $210-$380 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?

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