Assumption: This covers the common 3.5L V6 thermostat located at the front/lower radiator hose outlet on your QX60.

🔧 QX60 - Thermostat Replacement

Your thermostat controls engine operating temperature. When it sticks open or closed, you can get slow warm-up, overheating, weak cabin heat, or a check engine light. Replacing it involves draining some coolant, swapping the thermostat and seal, then refilling and bleeding air from the cooling system.

Difficulty Level: Intermediate | Estimated Time: 2-4 hours

---

⚠️ Safety & Precautions

• ⚠️ Only work on a fully cold engine to avoid scalding coolant.
• ⚠️ Support the vehicle with jack stands; never rely on a jack.
• ⚠️ Keep coolant away from kids/pets; it is toxic and slippery.
• ⚠️ Do not open the radiator/coolant cap when hot or pressurized.
• ⚠️ Battery disconnect is not required, but keep hands/tools clear of the cooling fan area.

---

🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Drain pan (at least 2-gallon)
• Shop towels
• Trim clip removal tool
• Flathead screwdriver
• Pliers for hose clamps
• Ratchet
• 10mm socket
• 12mm socket
• 6-inch extension
• Torque wrench (inch-pound or low-range)
• Gasket scraper (plastic)
• Spill-free coolant funnel kit (specialty)

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Engine thermostat - Qty: 1
• Thermostat seal / O-ring - Qty: 1
• Engine coolant (Nissan/INFINITI blue long-life premix) - Qty: 2-3 gallons
• Replacement hose clamps - Qty: 2

---

📋 Before You Begin

• 🧰 Park on level ground, set the parking brake, and chock the rear wheels.
• 🧰 Let the engine cool completely (overnight is best).
• 🧰 Set the HVAC to full hot during bleeding later (this opens the heater circuit).
• 🧰 Raise the front with a floor jack and place it securely on jack stands.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the lower splash shield (if equipped)

• Use a trim clip removal tool to pop out the plastic clips.
• Use a 10mm socket and ratchet to remove any bolts.
• Set the shield and hardware aside in a small pile so nothing gets lost.

Step 2: Relieve coolant pressure (cold engine only)

• Place shop towels around the coolant reservoir cap.
• Slowly loosen the cap by hand to release any remaining pressure, then remove it.

Step 3: Drain enough coolant to get below thermostat level

• Position a drain pan (at least 2-gallon) under the radiator drain area.
• Use a flathead screwdriver only if needed to open the drain cock; many open by hand.
• Drain until the radiator level drops (typically 1-2 gallons), then close the drain cock snugly by hand. Don’t over-tighten plastic drains.

Step 4: Access the thermostat housing

• From above, remove the intake duct if it blocks access: loosen clamps using a flathead screwdriver and reposition the duct.
• Locate the lower radiator hose where it connects to the engine—this connection is where the thermostat housing typically sits.

Step 5: Remove the lower radiator hose from the housing

• Use pliers for hose clamps to squeeze the clamp and slide it back on the hose.
• Twist the hose by hand to break it loose, then pull it off the housing.
• Catch any extra coolant with the drain pan and wipe spills with shop towels.

Step 6: Remove the thermostat housing

• Use a 10mm socket, ratchet, and extension to remove the housing bolts.
• Carefully separate the housing. If it sticks, tap gently by hand—do not pry hard on aluminum.

Step 7: Replace the thermostat and seal

• Remove the old thermostat and seal / O-ring.
• Clean the mating surfaces using a plastic gasket scraper and shop towels. (This means the two flat surfaces that touch each other.)
• Install the new thermostat in the same orientation as the old one.
• Install the new seal/O-ring (do not reuse the old one).

Step 8: Reinstall the housing and torque bolts

• Reinstall the housing bolts by hand first to avoid cross-threading.
• Use a torque wrench (a tool that tightens to an exact setting) with a 10mm socket to tighten evenly.
• Torque to 10 Nm (89 in-lbs).

Step 9: Reconnect the lower radiator hose

• Push the hose fully onto the housing.
• Use pliers for hose clamps to place the clamp back in its original position.
• If the clamp is weak or rusty, replace it with a new clamp.

Step 10: Reinstall any removed intake ducting and the splash shield

• Use a flathead screwdriver to tighten intake clamps snugly.
• Use a 10mm socket and trim clip removal tool to reinstall the splash shield.

Step 11: Refill and bleed the cooling system

• Install a spill-free coolant funnel kit (specialty) on the reservoir/radiator fill point (it helps prevent trapped air and spills).
• Slowly add Nissan/INFINITI blue long-life premix coolant until the level stays up.
• Start the engine and set HVAC to MAX HEAT, fan medium.
• Let it idle and watch for air bubbles in the funnel; add coolant as the level drops.
• Once the engine reaches operating temperature and you get steady hot air from vents, hold idle for a few more minutes. Small bubbles should stop.
• Shut the engine off, let it cool, then top off to the correct level and reinstall the cap.

---

✅ After Repair

• 🧪 Start the engine and check carefully for leaks at the thermostat housing and hose connection.
• 🧪 Take a 10-15 minute drive while watching the temperature gauge.
• 🧪 Let it cool completely, then recheck coolant level and top off if needed.
• 🧪 Verify the cabin heat is strong and consistent.

---

💰 DIY vs Shop Cost

Shop Cost: $350-$650 (parts + labor)

DIY Cost: $60-$160 (parts only)

You Save: $190-$590 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-4 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.