🔧 Maxima - Radiator Hose Replacement

On your Maxima, the radiator hoses carry coolant between the engine and radiator. Replacing a leaking, swollen, or cracked hose prevents overheating and coolant loss.

Quick check: Are you replacing the upper hose (top of radiator) or the lower hose (bottom of radiator)? I’ll include steps for both below.

Difficulty Level: Intermediate | Estimated Time: 1.0-2.5 hours

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⚠️ Safety & Precautions

• ⚠️ Never open the coolant cap on a hot engine; wait until fully cool.
• ⚠️ Support the car with jack stands if you lift it; never rely on a jack alone.
• ⚠️ Coolant is toxic—keep it off skin, paint, and away from pets; clean spills immediately.
• ⚠️ Keep hands/tools clear of the cooling fans; they can turn on unexpectedly.
• ⚠️ Battery disconnect is not required for this job, but keep tools away from the battery terminals.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• Catch pan (at least 10-quart)
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• Wheel chocks
• Flat-blade screwdriver
• Hose clamp pliers (specialty)
• Pick tool (small hook pick)
• Slip-joint pliers
• 10mm socket
• 3/8" drive ratchet
• 3" extension
• Funnel (spill-free coolant funnel kit) (specialty)
• Trim clip removal tool
• Shop towels

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Radiator hose (upper) - Qty: 1
• Radiator hose (lower) - Qty: 1
• Radiator hose clamps - Qty: 2
• Engine coolant (Nissan Blue long-life coolant, premixed 50/50) - Qty: 1-2 gallons

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📋 Before You Begin

• Park your Maxima on level ground, set the parking brake, and place wheel chocks behind the rear wheels.
• Let the engine cool completely (upper radiator hose should feel cool, not warm).
• Set the HVAC to HOT and fan on LOW later during bleeding (this helps push air out through the heater core).
• Place a catch pan under the radiator area before loosening anything.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the engine cover and gain access

• Open the hood and remove the plastic engine cover by pulling it upward (it’s held by rubber grommets).
• If access is tight at the radiator end, remove the upper air duct/cover fasteners as needed using a 10mm socket and ratchet.

Step 2: Relieve any residual pressure (engine cold)

• Place a thick shop towel over the coolant cap.
• Slowly loosen the cap to the first stop to release any pressure, then remove it fully.

Step 3: Drain enough coolant to get below the hose level

• Position the catch pan under the radiator drain area.
• Open the radiator drain cock (if accessible) by turning it by hand or with a flat-blade screwdriver (gentle—plastic can strip).
• Drain until the coolant level is below the hose you’re replacing (upper needs less draining than lower).
• Close the drain cock snugly by hand (do not overtighten plastic).

Step 4: If replacing the lower hose, raise the front of the car (optional but helps)

• Lift the front using a floor jack (rated 2-ton minimum) at the proper front jacking point.
• Set the vehicle onto jack stands (rated 2-ton minimum) and verify stability.

Step 5: Remove the old hose clamps

• Locate the two clamps for the hose you’re replacing (one at each end).
• If you have spring clamps: squeeze and slide the clamp back using hose clamp pliers (specialty). Spring clamps snap—keep a firm grip.
• If you have screw-type clamps: loosen using a flat-blade screwdriver (or 10mm socket if it has a hex head).

Step 6: Break the hose loose without damaging the fittings

• Twist the hose gently at the end to break the seal.
• If it’s stuck, carefully work around the edge with a pick tool (small hook pick) to let air in between the hose and the neck.
• Pull the hose off and aim it into the catch pan to control the spill.
• If there’s a small bypass/bleed hose attached (varies by routing), remove it with slip-joint pliers and transfer it to the new hose if applicable.

Step 7: Prep the fittings and install the new hose

• Wipe the radiator neck and engine-side neck clean with shop towels.
• Slide the clamps onto the new hose before installing the hose.
• Push the new hose fully onto each neck until it seats against the stop/bead.
• Reposition the clamps to the same location as original (behind the bead on the neck).

Step 8: Tighten/position clamps correctly

• Spring clamps: release using hose clamp pliers (specialty) so the clamp sits square and centered.
• Screw-type clamps: tighten with a flat-blade screwdriver until snug and the hose cannot rotate by hand.

Step 9: Refill coolant

• Install a funnel (spill-free coolant funnel kit) (specialty) at the coolant fill point.
• Refill with Nissan Blue long-life coolant, premixed 50/50 until full.
• Fill the coolant reservoir to the MAX line.

Step 10: Bleed air from the cooling system

• Start the engine and let it idle.
• Set HVAC to HOT and fan to LOW.
• Watch the funnel level; add coolant as the level drops.
• When the thermostat opens, you should feel the upper hose get hot and see steady flow in the funnel.
• If your Maxima has a coolant air-bleed screw near the coolant outlet: open it carefully using a flat-blade screwdriver until coolant flows without bubbles, then close it snugly.
• Let it idle until bubbles stop and the heater blows consistently hot.

Step 11: Final reassembly and cleanup

• Turn the engine off and let it cool.
• Remove the funnel, install the coolant cap securely, and reinstall any ducts/covers using a 10mm socket and ratchet.
• Reinstall the engine cover by pressing it down onto the grommets.
• If lifted, lower the vehicle safely using the floor jack (rated 2-ton minimum).

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✅ After Repair

• With the engine running and fully warm, inspect both ends of the new hose for seepage.
• Verify the heater output is hot and stable (a weak/ cold heater can mean trapped air).
• After the first drive and full cool-down, recheck the coolant reservoir level and top off to MAX as needed.
• Look under the car the next morning for any coolant drips.

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💰 DIY vs Shop Cost

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

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

You Save: $205-$410 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?

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.