🔧 Altima - Radiator Hose Replacement

On your Altima, the radiator hoses carry coolant between the radiator and the engine. A cracked/soft hose or a leaking clamp can cause coolant loss and overheating, so replacing a worn hose is important.

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

---

⚠️ Safety & Precautions

• ⚠️ Never open the radiator cap hot; let the engine cool fully.
• ⚠️ Coolant is toxic; keep away from kids/pets and clean spills.
• ⚠️ Support the car with jack stands if you go underneath.
• Wear gloves and safety glasses; spring clamps can snap.

---

🔧 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 2-gallon)
• Hose clamp pliers (specialty)
• Slip-joint pliers
• Flat-head screwdriver
• Pick tool (specialty)
• 10mm socket
• 3/8" drive ratchet
• 3/8" drive extension (6")
• Trim clip remover (specialty)
• Funnel
• Spill-free coolant funnel kit (specialty)
• Torque wrench (10–80 ft-lbs)
• Shop rags

---

🔩 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: 4
• Engine coolant (Nissan Long Life Antifreeze/Coolant Blue 50/50 premix) - Qty: 1-2 gallons

---

📋 Before You Begin

• Park on level ground, set the parking brake, and install wheel chocks.
• Let the engine cool completely (upper hose should feel cool to the touch).
• Set the HVAC to heat later during bleeding (this helps move coolant through the heater core).
• If you’ll replace the lower hose, plan to raise the front with a floor jack and support with jack stands.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Relieve pressure safely

• Confirm the engine is fully cool.
• Use a shop rag and slowly loosen the radiator cap by hand to relieve any leftover pressure, then remove it.

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

• Place a drain pan under the radiator.
• If equipped with a lower splash shield, remove it using a 10mm socket, ratchet, extension, and trim clip remover.
• Open the radiator drain cock (petcock) by hand or with a flat-head screwdriver if it has a slotted head.
• Drain until the coolant level is below the hose you’re replacing, then close the drain cock.
• Tip: Save clean coolant only.

Step 3: Remove the old hose clamps

• Use hose clamp pliers to compress the spring clamp and slide it back on the hose.
• If your Altima has worm-gear clamps, loosen them using a flat-head screwdriver.
• Hose clamp pliers grip spring clamps safely.

Step 4: Remove the old radiator hose

• Twist the hose to break it free (do not pry hard on radiator/engine nipples).
• If it’s stuck, carefully slide a pick tool (specialty) under the hose end to break the seal, then twist and pull off.
• Use shop rags to catch any remaining coolant.

Step 5: Prep the fittings and compare parts

• Wipe the radiator and engine hose nipples clean using shop rags.
• Compare the new hose to the old hose (length, bends, diameter) before installing.
• Slide new clamps onto the new hose now (use hose clamp pliers if spring style).

Step 6: Install the new hose and position clamps

• Push the hose fully onto each fitting until it bottoms out.
• Use hose clamp pliers to move spring clamps into position behind the bead (raised ridge) of the fitting.
• If using worm-gear clamps, tighten with a flat-head screwdriver until snug (do not crush the plastic radiator neck).

Step 7: Reinstall any covers/undertray

• Reinstall the splash shield using a 10mm socket, ratchet, and trim clip remover.
• Tighten splash shield bolts with a torque wrench: Torque to 7 Nm (62 in-lbs).

Step 8: Refill coolant

• Install a spill-free coolant funnel kit (specialty) onto the radiator neck.
• Slowly add Nissan Blue 50/50 premix coolant using the funnel.
• Fill the overflow reservoir to the MAX line.

Step 9: Bleed air from the cooling system

• Start the engine and let it idle with the funnel installed.
• Set the HVAC to HOT and low fan speed.
• Watch for air bubbles; keep the funnel level topped up so it never sucks air.
• When the engine reaches operating temp, the radiator fans may cycle on/off; continue until bubbles slow down and heater blows hot.
• If your Altima has an air relief plug on a coolant neck/pipe, open it carefully using the appropriate tool (often a 10mm socket), then close it once coolant flows steadily with no bubbles.
• Tip: Don’t rev it; let it purge gently.

Step 10: Finish up and check for leaks

• Shut the engine off and let it cool.
• Remove the spill-free funnel and install the radiator cap by hand until fully seated.
• Inspect both hose ends for seepage; re-position clamps using hose clamp pliers if needed.

---

✅ After Repair

• Test drive 10–15 minutes, then park and check for leaks with a flashlight.
• After the engine cools completely, recheck coolant level in the reservoir and top off with Nissan Blue 50/50 premix if needed.
• If the temperature gauge rises above normal or heat stops blowing hot, stop and re-bleed (air is still trapped).

---

💰 DIY vs Shop Cost

Shop Cost: $250-$550 (parts + labor)

DIY Cost: $40-$150 (parts only)

You Save: $110-$510 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.

---

🎯 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.