🔧 Altima - Radiator Hose Replacement

Replacing a radiator hose means removing the old hose and clamps, installing a new hose, then refilling and bleeding the cooling system. This fixes coolant leaks and prevents overheating from a split, swollen, or soft hose.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours

---

⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap hot; coolant can spray and burn you.
• ⚠️ Keep the car OFF (not in READY); cooling fans can start unexpectedly if the system is powered.
• ⚠️ Support the car with jack stands; never rely on a floor jack alone.
• ⚠️ Coolant is toxic; keep away from kids/pets and clean spills fast.
• ⚠️ Optional but safer: disconnect the 12V negative battery cable to prevent fan operation while your hands are near the radiator.

---

🔧 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 10-quart)
• Spill-free funnel kit (specialty)
• Pliers (hose clamp pliers preferred)
• Channel-lock pliers
• Pick tool (hose pick) (specialty)
• Flathead screwdriver
• 10mm socket
• 3/8" drive ratchet
• Extension bar (3"–6")
• Trim clip removal tool
• Shop towels
• Flashlight

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Upper radiator hose - Qty: 1
• Lower radiator hose - Qty: 1
• Radiator hose clamps - Qty: 2-4
• Engine coolant (Nissan Blue 50/50 premix) - Qty: 2-3 gallons

---

📋 Before You Begin

• Park on level ground, set the parking brake, and let the engine cool completely.
• Decide which hose you’re replacing: the upper hose goes from the top of the radiator to the engine; the lower hose goes from the bottom of the radiator down to the engine.
• If you’ll go underneath for the lower hose, place wheel chocks, then raise the front with a floor jack and support with jack stands.
• If you choose to disconnect the battery: use a 10mm socket to remove the 12V negative cable and keep it from touching the post.
• Quick check: If your clamps are the “spring band” type, you’ll squeeze them with pliers. If they’re screw-type, you’ll loosen them with a flathead screwdriver.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve pressure safely

• Make sure the engine is fully cold.
• Place shop towels over the radiator cap, then slowly loosen it to the first stop to release any leftover pressure, and remove it.

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

• Place a drain pan (at least 10-quart) under the radiator drain area.
• If access is tight, remove the lower splash shield using a 10mm socket, ratchet, extension bar, and a trim clip removal tool.
• Open the radiator drain (petcock) slowly and drain coolant until the level is below the hose you’re replacing.
• Drain less = less mess.

Step 3: Remove the old hose clamps

• For spring clamps: use pliers (hose clamp pliers preferred) to squeeze the clamp and slide it back on the hose.
• For screw-type clamps: loosen them with a flathead screwdriver and slide them back.

Step 4: Remove the old radiator hose

• Twist the hose by hand to break it loose.
• If it’s stuck, carefully work a pick tool (hose pick) (specialty) between the hose and the fitting to break the seal, then twist and pull off.
• Use shop towels to catch any coolant that spills.

Step 5: Prep the fittings and compare parts

• Use shop towels to wipe the radiator neck and engine fitting clean (no dirt or old rubber).
• Hold the new hose next to the old hose and confirm the same shape and length.

Step 6: Install the new hose and clamps

• Slide the new clamps onto the hose first.
• Push the hose fully onto each fitting until it bottoms out.
• Position the clamps behind the raised “bead” on the fitting.
• Spring clamps: use pliers to move the clamp into position.
• Screw-type clamps: tighten with a flathead screwdriver until snug (do not crush the hose).

Step 7: Reinstall any shields/undercovers

• Reinstall the splash shield using a 10mm socket, ratchet, and trim clip removal tool.
• Torque to 7 Nm (62 in-lbs)

Step 8: Refill coolant

• Install a spill-free funnel kit (specialty) on the radiator fill neck.
• Slowly add engine coolant (Nissan Blue 50/50 premix) until the radiator stays full.
• Fill the coolant reservoir to the MAX line.

Step 9: Bleed air from the system (burp it)

• Start the engine and set the heater to HOT (this helps coolant flow through the heater core).
• Let the engine warm up while watching the funnel level; add coolant as the level drops.
• When the thermostat opens, you’ll often see a level drop and air bubbles release; keep topping up as needed.
• Gently squeeze the upper radiator hose a few times with gloved hands to help move trapped air.
• Once bubbles stop and heat is steady from the vents, shut the engine off and let it cool completely, then recheck and top off.

Step 10: Final cap install

• Remove the funnel and install the radiator cap fully.
• Recheck the reservoir and set it to the correct level.

---

✅ After Repair

• Start the engine and inspect both ends of the new hose with a flashlight for leaks.
• Test drive 10–15 minutes, then recheck for leaks and confirm the heater blows hot.
• After the engine fully cools again, recheck the reservoir level and top off if needed.
• If the temperature gauge runs hot or you hear gurgling, stop and re-bleed air.

---

💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $45-$140 (parts only)

You Save: $175-$310 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-3.0 hours.

---

🎯 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.