🔧 Thermostat - Replacement

The thermostat controls coolant flow so your Versa warms up properly and stays at the right temperature. If it sticks open or closed, you can get poor heat, overheating, or a check engine light.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system. Hot coolant can cause severe burns.
• Use a drain pan and keep coolant away from children and pets.
• Do not reuse a damaged thermostat housing seal or gasket.
• Battery disconnect is not required for this repair.
• Work only on a cold engine.

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🔧 Required Tools

You'll need the following tools for this repair:

• Metric socket set
• 8mm socket
• 10mm socket
• Ratchet
• Short extension
• Torque wrench
• Flat-blade screwdriver
• Pliers
• Drain pan
• Funnel
• Shop towels
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Thermostat - Qty: 1
• Thermostat gasket or seal - Qty: 1
• Engine coolant - Qty: 1-2 gallons
• Distilled water - Qty: 1 gallon

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Make sure the engine is stone cold.
• Open the hood and locate the coolant reservoir and radiator cap.
• Have a drain pan ready before you open any coolant hose or housing.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Place a drain pan under the radiator drain area.
• Use a flat-blade screwdriver or hand to open the radiator drain if equipped, or disconnect the lower radiator hose if needed.
• Drain enough coolant so the level is below the thermostat housing.
• Catch every drop you can.

Step 2: Remove the intake duct or nearby parts

• Use a 8mm socket or 10mm socket to remove the intake duct or air box pieces blocking access.
• Loosen hose clamps with a flat-blade screwdriver if needed.
• Set all fasteners aside in order.

Step 3: Remove the thermostat housing

• Locate the thermostat housing where the upper coolant hose meets the engine.
• Use a 10mm socket and ratchet to remove the housing bolts.
• Pull the housing away carefully and note how the thermostat sits in place.
• Remove the old gasket or seal.
• Do not pry on the aluminum housing.

Step 4: Install the new thermostat

• Remove the old thermostat and compare it to the new one.
• Install the new thermostat in the same direction as the old one.
• Install the new gasket or seal.
• Reinstall the housing by hand first, then snug the bolts evenly.
• Torque to 10 Nm (89 in-lbs)

Step 5: Reinstall removed parts

• Reinstall the intake duct and any air box pieces you removed.
• Use the 8mm socket or 10mm socket to tighten fasteners.
• Make sure every hose clamp is secure.

Step 6: Refill the cooling system

• Close the drain point and refill with the correct coolant mixture.
• Use a funnel to fill slowly and avoid air pockets.
• Fill the coolant reservoir to the proper mark.
• If the system takes more coolant after starting, top it off as needed.

Step 7: Bleed air from the system

• Start the engine and let it idle with the heater set to hot.
• Watch the coolant level and add coolant if it drops.
• Let the engine reach operating temperature and check for warm air from the vents.
• Inspect around the thermostat housing for leaks.

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✅ After Repair

• Check coolant level again after the engine cools down.
• Verify the temperature gauge stays normal on a road test.
• Look for leaks under the car and around the housing.
• Recheck the reservoir level the next day and top off if needed.

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💰 DIY vs Shop Cost

Shop Cost: $280-$520 (parts + labor)

DIY Cost: $45-$110 (parts only)

You Save: $235-$410 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 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.