🔧 Thermostat - Replacement

Your Equinox uses a thermostat assembly in the cooling system to control engine temperature. If it sticks open or closed, you can get poor heat, overheating, or a check engine light. This job is straightforward for a beginner, but you must work cleanly and safely because the cooling system is pressurized and hot.

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

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⚠️ Safety & Precautions

• Let the engine cool completely before opening the cooling system.
• Never remove the radiator cap on a hot engine.
• Use gloves and safety glasses because coolant can burn skin and eyes.
• Catch and dispose of coolant properly; pets are attracted to its sweet smell.
• Disconnect the negative battery cable if you will be working near the radiator fan or connectors.

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🔧 Required Tools

You'll need the following tools for this repair:

• Metric socket set
• 1/4-inch ratchet
• 3/8-inch ratchet
• Extension bar
• 10mm socket
• Flat-blade screwdriver
• Pliers
• Drain pan
• Coolant funnel
• Torque wrench
• Safety glasses
• Nitrile gloves
• Jack and jack stands

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Thermostat assembly - Qty: 1
• Thermostat housing gasket or seal - Qty: 1
• Engine coolant (Dex-Cool compatible) - Qty: 1-2 gallons
• Coolant hose clamp - Qty: 1, if damaged

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine go cold.
• Put a drain pan under the radiator area.
• If needed, raise the front of the vehicle with a jack and support it with jack stands.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Drain the cooling system

• Open the radiator drain or lower hose connection and drain enough coolant to get below the thermostat level.
• Use a drain pan to catch the coolant.
• Keep coolant off belts and wiring.

Step 2: Remove intake ducting or access parts

• Use a flat-blade screwdriver or 10mm socket to remove any air ducting or covers blocking access to the thermostat housing.
• Move parts aside carefully so you do not crack plastic clips or hoses.

Step 3: Disconnect the thermostat housing area

• Use pliers to release the hose clamp from the thermostat housing.
• Twist the hose gently to break it loose, then pull it off the housing.
• Expect some leftover coolant to spill.

Step 4: Remove the thermostat housing

• Use a 10mm socket and ratchet to remove the thermostat housing bolts.
• Lift the housing off the engine.
• Remove the old thermostat and seal.
• Note how the thermostat sits before removing it.

Step 5: Clean the mounting surface

• Use a clean rag to wipe the mating surface on the engine.
• Do not scratch the aluminum surface.
• Make sure the old gasket material is fully removed.

Step 6: Install the new thermostat

• Install the new thermostat and new seal in the same orientation as the old one.
• Set the housing in place by hand first.
• Use a 10mm socket to install the bolts finger-tight.
• Torque to 10 N·m (89 in-lbs).

Step 7: Reconnect the hose and removed parts

• Push the hose back onto the housing.
• Use pliers to reposition the clamp.
• Reinstall any intake ducting or covers with the flat-blade screwdriver or 10mm socket.

Step 8: Refill and bleed the cooling system

• Pour in the correct Dex-Cool coolant mix using a coolant funnel.
• Fill to the proper level.
• Start the engine and let it idle with the heater on high.
• Watch the coolant level and add as needed while air bleeds out.
• Top off the reservoir after the engine reaches operating temperature and cools again.

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✅ After Repair

• Check for leaks at the thermostat housing and hose connections.
• Verify the temperature gauge reaches normal.
• Make sure the heater blows hot air.
• Recheck coolant level after a complete cool-down cycle.
• Scan for cooling system codes if the check engine light was on before the repair.

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💰 DIY vs Shop Cost

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

DIY Cost: $60-$140 (parts only)

You Save: $290-$510 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.