🔧 Thermostat - Replacement

The thermostat on your S60 controls engine coolant flow so the engine warms up correctly and stays at the right temperature. If it sticks open or closed, you can get slow warm-up, overheating, poor heater output, or a check engine light. On this engine, the thermostat is part of a housing assembly, so replacement usually means removing the housing and replacing the seal with it.

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

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⚠️ Safety & Precautions

• Let the engine cool fully before opening the cooling system. Hot coolant can cause severe burns.
• Use jack stands if you raise the front of the vehicle. Never rely on a jack alone.
• Coolant is toxic. Keep it off skin, paint, and away from pets and children.
• Disconnect the negative battery terminal if you will be working near the starter, alternator, or exposed wiring.
• Be careful around the radiator fan. It can start unexpectedly.

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🔧 Required Tools

You'll need the following tools for this repair:

• Metric socket set
• Metric wrench set
• Torx bit set
• Ratchet
• Breaker bar
• Drain pan
• Funnel
• Pick tool
• Flat trim tool
• Pliers
• Torque wrench
• Coolant vacuum filler (specialty)
• Jack stands
• Floor jack
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Thermostat housing assembly - Qty: 1
• Engine coolant - Qty: 2-3 gallons
• Thermostat housing seal - Qty: 1
• Coolant hose clamps - Qty: 2

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📋 Before You Begin

• Park on level ground and let the engine go stone cold.
• Set the parking brake and open the hood.
• If your S60 has an active message about engine temperature, note it before disconnecting power.
• Have a drain pan ready for coolant recovery.
• If equipped with a vacuum fill tool, plan to refill the cooling system that way to reduce air pockets.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the coolant

• Use a floor jack and jack stands if needed to access the lower radiator area safely.
• Place the drain pan under the radiator drain area or lower hose connection.
• Use pliers to release the lower hose clamp or open the drain point, then drain enough coolant to get below the thermostat housing level.
• Keep the coolant clean if reusing it.

Step 2: Remove intake and access parts

• Use a Torx bit set and ratchet to remove any intake ducting, covers, or brackets blocking access to the thermostat housing.
• Use a flat trim tool to release plastic clips without breaking them.
• Set all fasteners aside in order.

Step 3: Disconnect coolant hoses

• Use pliers to move the hose clamps back.
• Twist the hoses gently to break them free, then pull them off the thermostat housing.
• Expect some remaining coolant to spill into the drain pan.

Step 4: Remove the thermostat housing

• Use the metric socket set and ratchet to remove the thermostat housing bolts.
• Lift the housing out carefully and remove the old seal.
• Inspect the mating surface for corrosion or old gasket material.
• Do not scrape aluminum with steel tools.

Step 5: Install the new thermostat housing

• Install the new thermostat housing assembly with the new seal in the same orientation as the old one.
• Start all bolts by hand with the metric socket set before tightening.
• Torque to 10 Nm (89 in-lbs) unless your housing fasteners are marked differently.

Step 6: Reconnect hoses and reassemble

• Push the coolant hoses back onto the housing.
• Use pliers to position the hose clamps fully over the fittings.
• Reinstall any intake parts or covers using the Torx bit set and ratchet.

Step 7: Refill and bleed the cooling system

• Use a funnel or coolant vacuum filler (specialty) to refill the system with the correct coolant mix.
• If filling manually, add coolant slowly until full.
• Start the engine and let it idle with the heater set to hot.
• Top off coolant as the air purges from the system.
• Torque to 0 Nm for the cap only; close it securely by hand.

Step 8: Check for leaks and clear air

• Use a flashlight to inspect the thermostat housing, hoses, and drain area for leaks.
• Watch the temperature gauge and heater output.
• Shut the engine off, let it cool, then recheck coolant level and top off if needed.

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✅ After Repair

• Drive the vehicle until fully warm and confirm the temperature stays steady.
• Check for coolant smell, leaks, or warning messages.
• Recheck coolant level after the next full cool-down cycle.
• If the check engine light was on, clear codes and verify they do not return.

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💰 DIY vs Shop Cost

Shop Cost: $450-$850 (parts + labor)

DIY Cost: $120-$260 (parts only)

You Save: $330-$590 by doing it yourself!

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